1f8ac37e2d
The transform was just added with:
115d2f69a5
...but as noted in post-commit feedback, it was
confusingly coded. Now, we create the final
expected canonicalized form directly and put
an extra use check on the match, so we should
not ever end up with more instructions.
245 lines
5.8 KiB
LLVM
245 lines
5.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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declare void @use(i1)
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; Check that we fold the condition of branches of the
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; form: br <condition> dest1, dest2, where dest1 == dest2.
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define i32 @test(i32 %x) {
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; CHECK-LABEL: @test(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 false, label [[MERGE:%.*]], label [[MERGE]]
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; CHECK: merge:
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; CHECK-NEXT: ret i32 [[X:%.*]]
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;
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entry:
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%cmp = icmp ult i32 %x, 7
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br i1 %cmp, label %merge, label %merge
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merge:
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ret i32 %x
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}
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@global = global i8 0
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define i32 @pat(i32 %x) {
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; CHECK-LABEL: @pat(
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; CHECK-NEXT: br i1 false, label [[PATATINO:%.*]], label [[PATATINO]]
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; CHECK: patatino:
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; CHECK-NEXT: ret i32 [[X:%.*]]
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;
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%y = icmp eq i32 27, ptrtoint(ptr @global to i32)
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br i1 %y, label %patatino, label %patatino
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patatino:
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ret i32 %x
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}
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define i1 @test01(i1 %cond) {
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; CHECK-LABEL: @test01(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_FALSE_1:%.*]]
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; CHECK: if.true.1:
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; CHECK-NEXT: br label [[MERGE_1:%.*]]
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; CHECK: if.false.1:
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; CHECK-NEXT: br label [[MERGE_1]]
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; CHECK: merge.1:
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; CHECK-NEXT: br i1 [[COND]], label [[IF_TRUE_2:%.*]], label [[IF_FALSE_2:%.*]]
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; CHECK: if.true.2:
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; CHECK-NEXT: br label [[MERGE_2:%.*]]
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; CHECK: if.false.2:
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; CHECK-NEXT: br label [[MERGE_2]]
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; CHECK: merge.2:
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; CHECK-NEXT: ret i1 [[COND]]
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;
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entry:
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br i1 %cond, label %if.true.1, label %if.false.1
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if.true.1:
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br label %merge.1
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if.false.1:
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br label %merge.1
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merge.1:
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%merge.cond.1 = phi i1 [true, %if.true.1], [false, %if.false.1]
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br i1 %merge.cond.1, label %if.true.2, label %if.false.2
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if.true.2:
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br label %merge.2
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if.false.2:
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br label %merge.2
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merge.2:
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%merge.cond.2 = phi i1 [true, %if.true.2], [false, %if.false.2]
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ret i1 %merge.cond.2
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}
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define i1 @test02(i1 %cond) {
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; CHECK-LABEL: @test02(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[COND:%.*]], label [[IF_TRUE_1:%.*]], label [[IF_FALSE_1:%.*]]
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; CHECK: if.true.1:
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; CHECK-NEXT: br label [[MERGE_1:%.*]]
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; CHECK: if.false.1:
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; CHECK-NEXT: br label [[MERGE_1]]
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; CHECK: merge.1:
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; CHECK-NEXT: br i1 [[COND]], label [[IF_FALSE_2:%.*]], label [[IF_TRUE_2:%.*]]
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; CHECK: if.true.2:
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; CHECK-NEXT: br label [[MERGE_2:%.*]]
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; CHECK: if.false.2:
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; CHECK-NEXT: br label [[MERGE_2]]
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; CHECK: merge.2:
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; CHECK-NEXT: ret i1 [[COND]]
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;
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entry:
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br i1 %cond, label %if.true.1, label %if.false.1
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if.true.1:
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br label %merge.1
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if.false.1:
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br label %merge.1
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merge.1:
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%merge.cond.1 = phi i1 [false, %if.true.1], [true, %if.false.1]
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br i1 %merge.cond.1, label %if.true.2, label %if.false.2
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if.true.2:
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br label %merge.2
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if.false.2:
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br label %merge.2
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merge.2:
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%merge.cond.2 = phi i1 [false, %if.true.2], [true, %if.false.2]
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ret i1 %merge.cond.2
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}
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; if (x && !y) ret 42; ret 3 --> if (!x || y) ret 3; ret 42
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define i32 @logical_and_not(i1 %x, i1 %y) {
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; CHECK-LABEL: @logical_and_not(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NOT_X:%.*]] = xor i1 [[X:%.*]], true
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; CHECK-NEXT: [[TMP0:%.*]] = select i1 [[NOT_X]], i1 true, i1 [[Y:%.*]]
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; CHECK-NEXT: br i1 [[TMP0]], label [[F:%.*]], label [[T:%.*]]
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; CHECK: t:
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; CHECK-NEXT: ret i32 42
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; CHECK: f:
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; CHECK-NEXT: ret i32 3
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;
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entry:
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%noty = xor i1 %y, true
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%and = select i1 %x, i1 %noty, i1 false
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br i1 %and, label %t, label %f
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t:
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ret i32 42
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f:
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ret i32 3
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}
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; if (x && y || !x) ret 3; ret 42 --> if (!x || y) ret 3; ret 42
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define i32 @logical_and_or(i1 %x, i1 %y) {
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; CHECK-LABEL: @logical_and_or(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NOT_X:%.*]] = xor i1 [[X:%.*]], true
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; CHECK-NEXT: [[AND:%.*]] = select i1 [[NOT_X]], i1 true, i1 [[Y:%.*]]
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; CHECK-NEXT: br i1 [[AND]], label [[F:%.*]], label [[T:%.*]]
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; CHECK: t:
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; CHECK-NEXT: ret i32 42
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; CHECK: f:
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; CHECK-NEXT: ret i32 3
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;
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entry:
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%and = select i1 %x, i1 %y, i1 true
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br i1 %and, label %f, label %t
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t:
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ret i32 42
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f:
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ret i32 3
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}
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; if (!x || y) ret 3; ret 42
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define i32 @logical_or_not(i1 %x, i1 %y) {
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; CHECK-LABEL: @logical_or_not(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NOTX:%.*]] = xor i1 [[X:%.*]], true
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; CHECK-NEXT: [[AND:%.*]] = select i1 [[NOTX]], i1 true, i1 [[Y:%.*]]
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; CHECK-NEXT: br i1 [[AND]], label [[F:%.*]], label [[T:%.*]]
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; CHECK: t:
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; CHECK-NEXT: ret i32 42
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; CHECK: f:
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; CHECK-NEXT: ret i32 3
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;
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entry:
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%notx = xor i1 %x, true
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%and = select i1 %notx, i1 true, i1 %y
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br i1 %and, label %f, label %t
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t:
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ret i32 42
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f:
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ret i32 3
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}
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; negative test
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define i32 @logical_and_not_use1(i1 %x, i1 %y) {
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; CHECK-LABEL: @logical_and_not_use1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NOTY:%.*]] = xor i1 [[Y:%.*]], true
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; CHECK-NEXT: call void @use(i1 [[NOTY]])
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; CHECK-NEXT: [[AND:%.*]] = select i1 [[X:%.*]], i1 [[NOTY]], i1 false
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; CHECK-NEXT: br i1 [[AND]], label [[T:%.*]], label [[F:%.*]]
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; CHECK: t:
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; CHECK-NEXT: ret i32 42
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; CHECK: f:
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; CHECK-NEXT: ret i32 3
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;
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entry:
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%noty = xor i1 %y, true
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call void @use(i1 %noty)
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%and = select i1 %x, i1 %noty, i1 false
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br i1 %and, label %t, label %f
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t:
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ret i32 42
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f:
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ret i32 3
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}
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; negative test
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define i32 @logical_and_not_use2(i1 %x, i1 %y) {
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; CHECK-LABEL: @logical_and_not_use2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[NOTY:%.*]] = xor i1 [[Y:%.*]], true
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; CHECK-NEXT: [[AND:%.*]] = select i1 [[X:%.*]], i1 [[NOTY]], i1 false
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; CHECK-NEXT: call void @use(i1 [[AND]])
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; CHECK-NEXT: br i1 [[AND]], label [[T:%.*]], label [[F:%.*]]
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; CHECK: t:
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; CHECK-NEXT: ret i32 42
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; CHECK: f:
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; CHECK-NEXT: ret i32 3
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;
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entry:
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%noty = xor i1 %y, true
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%and = select i1 %x, i1 %noty, i1 false
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call void @use(i1 %and)
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br i1 %and, label %t, label %f
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t:
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ret i32 42
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f:
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ret i32 3
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}
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