641baf1646
SimplifyAssociativeOrCommutative) "(A op C1) op C2" -> "A op (C1 op C2)", which previously was only done if C1 and C2 were constants, to occur whenever "C1 op C2" simplifies (a la InstructionSimplify). Since the simplifying operand combination can no longer be assumed to be the right-hand terms, consider all of the possible permutations. When compiling "gcc as one big file", transform 2 (i.e. using right-hand operands) fires about 4000 times but it has to be said that most of the time the simplifying operands are both constants. Transforms 3, 4 and 5 each fired once. Transform 6, which is an existing transform that I didn't change, never fired. With this change, the testcase is now optimized perfectly with one run of instcombine (previously it required instcombine + reassociate + instcombine, and it may just have been luck that this worked). llvm-svn: 119002
559 lines
13 KiB
LLVM
559 lines
13 KiB
LLVM
; This test makes sure that these instructions are properly eliminated.
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; PR1822
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; RUN: opt < %s -instcombine -S | FileCheck %s
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define i32 @test1(i32 %A, i32 %B) {
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%C = select i1 false, i32 %A, i32 %B
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ret i32 %C
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; CHECK: @test1
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; CHECK: ret i32 %B
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}
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define i32 @test2(i32 %A, i32 %B) {
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%C = select i1 true, i32 %A, i32 %B
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ret i32 %C
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; CHECK: @test2
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; CHECK: ret i32 %A
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}
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define i32 @test3(i1 %C, i32 %I) {
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; V = I
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%V = select i1 %C, i32 %I, i32 %I
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ret i32 %V
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; CHECK: @test3
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; CHECK: ret i32 %I
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}
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define i1 @test4(i1 %C) {
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; V = C
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%V = select i1 %C, i1 true, i1 false
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ret i1 %V
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; CHECK: @test4
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; CHECK: ret i1 %C
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}
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define i1 @test5(i1 %C) {
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; V = !C
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%V = select i1 %C, i1 false, i1 true
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ret i1 %V
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; CHECK: @test5
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; CHECK: xor i1 %C, true
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; CHECK: ret i1
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}
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define i32 @test6(i1 %C) {
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; V = cast C to int
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%V = select i1 %C, i32 1, i32 0
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ret i32 %V
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; CHECK: @test6
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; CHECK: %V = zext i1 %C to i32
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; CHECK: ret i32 %V
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}
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define i1 @test7(i1 %C, i1 %X) {
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; R = or C, X
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%R = select i1 %C, i1 true, i1 %X
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ret i1 %R
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; CHECK: @test7
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; CHECK: %R = or i1 %C, %X
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; CHECK: ret i1 %R
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}
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define i1 @test8(i1 %C, i1 %X) {
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; R = and C, X
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%R = select i1 %C, i1 %X, i1 false
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ret i1 %R
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; CHECK: @test8
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; CHECK: %R = and i1 %C, %X
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; CHECK: ret i1 %R
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}
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define i1 @test9(i1 %C, i1 %X) {
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; R = and !C, X
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%R = select i1 %C, i1 false, i1 %X
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ret i1 %R
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; CHECK: @test9
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; CHECK: xor i1 %C, true
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; CHECK: %R = and i1
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; CHECK: ret i1 %R
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}
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define i1 @test10(i1 %C, i1 %X) {
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; R = or !C, X
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%R = select i1 %C, i1 %X, i1 true
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ret i1 %R
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; CHECK: @test10
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; CHECK: xor i1 %C, true
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; CHECK: %R = or i1
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; CHECK: ret i1 %R
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}
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define i32 @test11(i32 %a) {
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%C = icmp eq i32 %a, 0
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%R = select i1 %C, i32 0, i32 1
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ret i32 %R
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; CHECK: @test11
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; CHECK: icmp ne i32 %a, 0
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; CHECK: %R = zext i1
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; CHECK: ret i32 %R
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}
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define i32 @test12(i1 %cond, i32 %a) {
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%b = or i32 %a, 1
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%c = select i1 %cond, i32 %b, i32 %a
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ret i32 %c
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; CHECK: @test12
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; CHECK: %b = zext i1 %cond to i32
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; CHECK: %c = or i32 %b, %a
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; CHECK: ret i32 %c
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}
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define i32 @test12a(i1 %cond, i32 %a) {
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%b = ashr i32 %a, 1
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%c = select i1 %cond, i32 %b, i32 %a
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ret i32 %c
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; CHECK: @test12a
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; CHECK: %b = zext i1 %cond to i32
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; CHECK: %c = ashr i32 %a, %b
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; CHECK: ret i32 %c
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}
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define i32 @test12b(i1 %cond, i32 %a) {
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%b = ashr i32 %a, 1
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%c = select i1 %cond, i32 %a, i32 %b
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ret i32 %c
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; CHECK: @test12b
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; CHECK: zext i1 %cond to i32
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; CHECK: %b = xor i32
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; CHECK: %c = ashr i32 %a, %b
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; CHECK: ret i32 %c
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}
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define i32 @test13(i32 %a, i32 %b) {
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%C = icmp eq i32 %a, %b
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%V = select i1 %C, i32 %a, i32 %b
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ret i32 %V
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; CHECK: @test13
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; CHECK: ret i32 %b
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}
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define i32 @test13a(i32 %a, i32 %b) {
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%C = icmp ne i32 %a, %b
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%V = select i1 %C, i32 %a, i32 %b
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ret i32 %V
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; CHECK: @test13a
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; CHECK: ret i32 %a
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}
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define i32 @test13b(i32 %a, i32 %b) {
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%C = icmp eq i32 %a, %b
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%V = select i1 %C, i32 %b, i32 %a
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ret i32 %V
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; CHECK: @test13b
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; CHECK: ret i32 %a
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}
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define i1 @test14a(i1 %C, i32 %X) {
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%V = select i1 %C, i32 %X, i32 0
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; (X < 1) | !C
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%R = icmp slt i32 %V, 1
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ret i1 %R
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; CHECK: @test14a
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; CHECK: icmp slt i32 %X, 1
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; CHECK: xor i1 %C, true
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; CHECK: or i1
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; CHECK: ret i1 %R
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}
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define i1 @test14b(i1 %C, i32 %X) {
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%V = select i1 %C, i32 0, i32 %X
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; (X < 1) | C
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%R = icmp slt i32 %V, 1
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ret i1 %R
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; CHECK: @test14b
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; CHECK: icmp slt i32 %X, 1
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; CHECK: or i1
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; CHECK: ret i1 %R
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}
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;; Code sequence for (X & 16) ? 16 : 0
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define i32 @test15a(i32 %X) {
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%t1 = and i32 %X, 16
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%t2 = icmp eq i32 %t1, 0
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%t3 = select i1 %t2, i32 0, i32 16
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ret i32 %t3
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; CHECK: @test15a
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; CHECK: %t1 = and i32 %X, 16
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; CHECK: ret i32 %t1
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}
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;; Code sequence for (X & 32) ? 0 : 24
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define i32 @test15b(i32 %X) {
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%t1 = and i32 %X, 32
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%t2 = icmp eq i32 %t1, 0
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%t3 = select i1 %t2, i32 32, i32 0
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ret i32 %t3
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; CHECK: @test15b
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; CHECK: %t1 = and i32 %X, 32
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; CHECK: xor i32 %t1, 32
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; CHECK: ret i32
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}
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;; Alternate code sequence for (X & 16) ? 16 : 0
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define i32 @test15c(i32 %X) {
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%t1 = and i32 %X, 16
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%t2 = icmp eq i32 %t1, 16
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%t3 = select i1 %t2, i32 16, i32 0
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ret i32 %t3
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; CHECK: @test15c
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; CHECK: %t1 = and i32 %X, 16
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; CHECK: ret i32 %t1
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}
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;; Alternate code sequence for (X & 16) ? 16 : 0
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define i32 @test15d(i32 %X) {
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%t1 = and i32 %X, 16
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%t2 = icmp ne i32 %t1, 0
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%t3 = select i1 %t2, i32 16, i32 0
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ret i32 %t3
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; CHECK: @test15d
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; CHECK: %t1 = and i32 %X, 16
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; CHECK: ret i32 %t1
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}
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define i32 @test16(i1 %C, i32* %P) {
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%P2 = select i1 %C, i32* %P, i32* null
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%V = load i32* %P2
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ret i32 %V
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; CHECK: @test16
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; CHECK-NEXT: %V = load i32* %P
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; CHECK: ret i32 %V
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}
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define i1 @test17(i32* %X, i1 %C) {
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%R = select i1 %C, i32* %X, i32* null
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%RV = icmp eq i32* %R, null
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ret i1 %RV
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; CHECK: @test17
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; CHECK: icmp eq i32* %X, null
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; CHECK: xor i1 %C, true
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; CHECK: %RV = or i1
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; CHECK: ret i1 %RV
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}
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define i32 @test18(i32 %X, i32 %Y, i1 %C) {
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%R = select i1 %C, i32 %X, i32 0
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%V = sdiv i32 %Y, %R
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ret i32 %V
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; CHECK: @test18
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; CHECK: %V = sdiv i32 %Y, %X
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; CHECK: ret i32 %V
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}
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define i32 @test19(i32 %x) {
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%tmp = icmp ugt i32 %x, 2147483647
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%retval = select i1 %tmp, i32 -1, i32 0
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ret i32 %retval
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; CHECK: @test19
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; CHECK-NEXT: ashr i32 %x, 31
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; CHECK-NEXT: ret i32
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}
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define i32 @test20(i32 %x) {
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%tmp = icmp slt i32 %x, 0
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%retval = select i1 %tmp, i32 -1, i32 0
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ret i32 %retval
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; CHECK: @test20
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; CHECK-NEXT: ashr i32 %x, 31
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; CHECK-NEXT: ret i32
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}
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define i64 @test21(i32 %x) {
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%tmp = icmp slt i32 %x, 0
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%retval = select i1 %tmp, i64 -1, i64 0
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ret i64 %retval
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; CHECK: @test21
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; CHECK-NEXT: ashr i32 %x, 31
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; CHECK-NEXT: sext i32
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; CHECK-NEXT: ret i64
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}
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define i16 @test22(i32 %x) {
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%tmp = icmp slt i32 %x, 0
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%retval = select i1 %tmp, i16 -1, i16 0
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ret i16 %retval
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; CHECK: @test22
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; CHECK-NEXT: ashr i32 %x, 31
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; CHECK-NEXT: trunc i32
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; CHECK-NEXT: ret i16
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}
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define i1 @test23(i1 %a, i1 %b) {
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%c = select i1 %a, i1 %b, i1 %a
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ret i1 %c
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; CHECK: @test23
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; CHECK-NEXT: %c = and i1 %a, %b
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; CHECK-NEXT: ret i1 %c
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}
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define i1 @test24(i1 %a, i1 %b) {
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%c = select i1 %a, i1 %a, i1 %b
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ret i1 %c
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; CHECK: @test24
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; CHECK-NEXT: %c = or i1 %a, %b
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; CHECK-NEXT: ret i1 %c
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}
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define i32 @test25(i1 %c) {
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entry:
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br i1 %c, label %jump, label %ret
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jump:
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br label %ret
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ret:
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%a = phi i1 [true, %jump], [false, %entry]
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%b = select i1 %a, i32 10, i32 20
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ret i32 %b
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; CHECK: @test25
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; CHECK: %a = phi i32 [ 10, %jump ], [ 20, %entry ]
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; CHECK-NEXT: ret i32 %a
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}
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define i32 @test26(i1 %cond) {
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entry:
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br i1 %cond, label %jump, label %ret
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jump:
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%c = or i1 false, false
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br label %ret
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ret:
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%a = phi i1 [true, %jump], [%c, %entry]
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%b = select i1 %a, i32 10, i32 20
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ret i32 %b
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; CHECK: @test26
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; CHECK: %a = phi i32 [ 10, %jump ], [ 20, %entry ]
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; CHECK-NEXT: ret i32 %a
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}
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define i32 @test27(i1 %c, i32 %A, i32 %B) {
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entry:
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br i1 %c, label %jump, label %ret
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jump:
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br label %ret
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ret:
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%a = phi i1 [true, %jump], [false, %entry]
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%b = select i1 %a, i32 %A, i32 %B
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ret i32 %b
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; CHECK: @test27
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; CHECK: %a = phi i32 [ %A, %jump ], [ %B, %entry ]
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; CHECK-NEXT: ret i32 %a
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}
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define i32 @test28(i1 %cond, i32 %A, i32 %B) {
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entry:
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br i1 %cond, label %jump, label %ret
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jump:
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br label %ret
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ret:
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%c = phi i32 [%A, %jump], [%B, %entry]
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%a = phi i1 [true, %jump], [false, %entry]
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%b = select i1 %a, i32 %A, i32 %c
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ret i32 %b
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; CHECK: @test28
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; CHECK: %a = phi i32 [ %A, %jump ], [ %B, %entry ]
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; CHECK-NEXT: ret i32 %a
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}
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define i32 @test29(i1 %cond, i32 %A, i32 %B) {
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entry:
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br i1 %cond, label %jump, label %ret
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jump:
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br label %ret
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ret:
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%c = phi i32 [%A, %jump], [%B, %entry]
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%a = phi i1 [true, %jump], [false, %entry]
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br label %next
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next:
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%b = select i1 %a, i32 %A, i32 %c
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ret i32 %b
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; CHECK: @test29
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; CHECK: %a = phi i32 [ %A, %jump ], [ %B, %entry ]
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; CHECK: ret i32 %a
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}
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; SMAX(SMAX(x, y), x) -> SMAX(x, y)
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define i32 @test30(i32 %x, i32 %y) {
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%cmp = icmp sgt i32 %x, %y
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%cond = select i1 %cmp, i32 %x, i32 %y
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%cmp5 = icmp sgt i32 %cond, %x
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%retval = select i1 %cmp5, i32 %cond, i32 %x
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ret i32 %retval
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; CHECK: @test30
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; CHECK: ret i32 %cond
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}
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; UMAX(UMAX(x, y), x) -> UMAX(x, y)
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define i32 @test31(i32 %x, i32 %y) {
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%cmp = icmp ugt i32 %x, %y
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%cond = select i1 %cmp, i32 %x, i32 %y
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%cmp5 = icmp ugt i32 %cond, %x
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%retval = select i1 %cmp5, i32 %cond, i32 %x
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ret i32 %retval
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; CHECK: @test31
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; CHECK: ret i32 %cond
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}
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; SMIN(SMIN(x, y), x) -> SMIN(x, y)
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define i32 @test32(i32 %x, i32 %y) {
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%cmp = icmp sgt i32 %x, %y
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%cond = select i1 %cmp, i32 %y, i32 %x
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%cmp5 = icmp sgt i32 %cond, %x
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%retval = select i1 %cmp5, i32 %x, i32 %cond
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ret i32 %retval
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; CHECK: @test32
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; CHECK: ret i32 %cond
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}
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; MAX(MIN(x, y), x) -> x
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define i32 @test33(i32 %x, i32 %y) {
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%cmp = icmp sgt i32 %x, %y
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%cond = select i1 %cmp, i32 %y, i32 %x
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%cmp5 = icmp sgt i32 %cond, %x
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%retval = select i1 %cmp5, i32 %cond, i32 %x
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ret i32 %retval
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; CHECK: @test33
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; CHECK: ret i32 %x
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}
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; MIN(MAX(x, y), x) -> x
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define i32 @test34(i32 %x, i32 %y) {
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%cmp = icmp sgt i32 %x, %y
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%cond = select i1 %cmp, i32 %x, i32 %y
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%cmp5 = icmp sgt i32 %cond, %x
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%retval = select i1 %cmp5, i32 %x, i32 %cond
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ret i32 %retval
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; CHECK: @test34
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; CHECK: ret i32 %x
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}
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define i32 @test35(i32 %x) {
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%cmp = icmp sge i32 %x, 0
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%cond = select i1 %cmp, i32 60, i32 100
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ret i32 %cond
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; CHECK: @test35
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; CHECK: ashr i32 %x, 31
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; CHECK: and i32 {{.*}}, 40
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; CHECK: add i32 {{.*}}, 60
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; CHECK: ret
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}
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define i32 @test36(i32 %x) {
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%cmp = icmp slt i32 %x, 0
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%cond = select i1 %cmp, i32 60, i32 100
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ret i32 %cond
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; CHECK: @test36
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; CHECK: ashr i32 %x, 31
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; CHECK: and i32 {{.*}}, -40
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; CHECK: add i32 {{.*}}, 100
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; CHECK: ret
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}
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define i32 @test37(i32 %x) {
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%cmp = icmp sgt i32 %x, -1
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%cond = select i1 %cmp, i32 1, i32 -1
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ret i32 %cond
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; CHECK: @test37
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; CHECK: ashr i32 %x, 31
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; CHECK: or i32 {{.*}}, 1
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; CHECK: ret
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}
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define i1 @test38(i1 %cond) {
|
|
%zero = alloca i32
|
|
%one = alloca i32
|
|
%ptr = select i1 %cond, i32* %zero, i32* %one
|
|
%isnull = icmp eq i32* %ptr, null
|
|
ret i1 %isnull
|
|
; CHECK: @test38
|
|
; CHECK: ret i1 false
|
|
}
|
|
|
|
define i1 @test39(i1 %cond, double %x) {
|
|
%s = select i1 %cond, double %x, double 0x7FF0000000000000 ; RHS = +infty
|
|
%cmp = fcmp ule double %x, %s
|
|
ret i1 %cmp
|
|
; CHECK: @test39
|
|
; CHECK: ret i1 true
|
|
}
|
|
|
|
define i1 @test40(i1 %cond) {
|
|
%a = alloca i32
|
|
%b = alloca i32
|
|
%c = alloca i32
|
|
%s = select i1 %cond, i32* %a, i32* %b
|
|
%r = icmp eq i32* %s, %c
|
|
ret i1 %r
|
|
; CHECK: @test40
|
|
; CHECK: ret i1 false
|
|
}
|
|
|
|
define i1 @test41(i1 %cond) {
|
|
%zero = alloca i32
|
|
%one = alloca i32
|
|
br i1 %cond, label %true, label %false
|
|
true:
|
|
br label %ret
|
|
false:
|
|
br label %ret
|
|
ret:
|
|
%ptr = phi i32* [ %zero, %true ] , [ %one, %false ]
|
|
%isnull = icmp eq i32* %ptr, null
|
|
ret i1 %isnull
|
|
; CHECK: @test41
|
|
; CHECK: ret i1 false
|
|
}
|
|
|
|
define i1 @test42(i1 %cond, double %x) {
|
|
br i1 %cond, label %true, label %false
|
|
true:
|
|
br label %ret
|
|
false:
|
|
br label %ret
|
|
ret:
|
|
%p = phi double [ %x, %true ], [ 0x7FF0000000000000, %false ]; RHS = +infty
|
|
%cmp = fcmp ule double %x, %p
|
|
ret i1 %cmp
|
|
; CHECK: @test42
|
|
; CHECK: ret i1 true
|
|
}
|
|
|
|
define i1 @test43(i1 %cond) {
|
|
%a = alloca i32
|
|
%b = alloca i32
|
|
%c = alloca i32
|
|
br i1 %cond, label %true, label %false
|
|
true:
|
|
br label %ret
|
|
false:
|
|
br label %ret
|
|
ret:
|
|
%p = phi i32* [ %a, %true ], [ %b, %false ]
|
|
%r = icmp eq i32* %p, %c
|
|
ret i1 %r
|
|
; CHECK: @test43
|
|
; CHECK: ret i1 false
|
|
}
|
|
|
|
define i32 @test44(i1 %cond, i32 %x, i32 %y) {
|
|
%z = and i32 %x, %y
|
|
%s = select i1 %cond, i32 %y, i32 %z
|
|
%r = and i32 %x, %s
|
|
ret i32 %r
|
|
; CHECK: @test44
|
|
; CHECK: %r = and i32 %x, %y
|
|
; CHECK: ret i32 %r
|
|
}
|