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clang-p2996/llvm/test/Transforms/InstSimplify/ConstProp/loads.ll
Nikita Popov c117d77e93 [ConstantFold] Refactor load folding 
This refactors load folding to happen in two cleanly separated
steps: ConstantFoldLoadFromConstPtr() takes a pointer to load from
and decomposes it into a constant initializer base and an offset.
Then ConstantFoldLoadFromConst() loads from that initializer at
the given offset. This makes the core logic independent of having
actual GEP expressions (and those GEP expressions having certain
structure) and will allow exposing ConstantFoldLoadFromConst() as
an independent API in the future.

This is mostly only a refactoring, but it does make the folding
logic slightly more powerful.

Differential Revision: https://reviews.llvm.org/D111023
2021-10-05 18:07:57 +02:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -data-layout="e-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64" -instcombine -S | FileCheck %s --check-prefixes=CHECK,LE
; RUN: opt < %s -data-layout="E-p:64:64:64-p1:16:16:16-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64" -instcombine -S | FileCheck %s --check-prefixes=CHECK,BE
; {{ 0xDEADBEEF, 0xBA }, 0xCAFEBABE}
@g1 = constant {{i32,i8},i32} {{i32,i8} { i32 -559038737, i8 186 }, i32 -889275714 }
@g2 = constant double 1.0
; { 0x7B, 0x06B1BFF8 }
@g3 = constant {i64, i64} { i64 123, i64 112312312 }
; Simple load
define i32 @test1() {
; CHECK-LABEL: @test1(
; CHECK-NEXT: ret i32 -559038737
;
%r = load i32, i32* getelementptr ({{i32,i8},i32}, {{i32,i8},i32}* @g1, i32 0, i32 0, i32 0)
ret i32 %r
}
; PR3152
; Load of first 16 bits of 32-bit value.
define i16 @test2() {
; LE-LABEL: @test2(
; LE-NEXT: ret i16 -16657
;
; BE-LABEL: @test2(
; BE-NEXT: ret i16 -8531
;
%r = load i16, i16* bitcast(i32* getelementptr ({{i32,i8},i32}, {{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*)
ret i16 %r
}
define i16 @test2_addrspacecast() {
; LE-LABEL: @test2_addrspacecast(
; LE-NEXT: ret i16 -16657
;
; BE-LABEL: @test2_addrspacecast(
; BE-NEXT: ret i16 -8531
;
%r = load i16, i16 addrspace(1)* addrspacecast(i32* getelementptr ({{i32,i8},i32}, {{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16 addrspace(1)*)
ret i16 %r
}
; Load of second 16 bits of 32-bit value.
define i16 @test3() {
; LE-LABEL: @test3(
; LE-NEXT: ret i16 -8531
;
; BE-LABEL: @test3(
; BE-NEXT: ret i16 -16657
;
%r = load i16, i16* getelementptr(i16, i16* bitcast(i32* getelementptr ({{i32,i8},i32}, {{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 1)
ret i16 %r
}
; Load of 8 bit field + tail padding.
define i16 @test4() {
; LE-LABEL: @test4(
; LE-NEXT: ret i16 186
;
; BE-LABEL: @test4(
; BE-NEXT: ret i16 -17920
;
%r = load i16, i16* getelementptr(i16, i16* bitcast(i32* getelementptr ({{i32,i8},i32}, {{i32,i8},i32}* @g1, i32 0, i32 0, i32 0) to i16*), i32 2)
ret i16 %r
}
; Load of double bits.
define i64 @test6() {
; CHECK-LABEL: @test6(
; CHECK-NEXT: ret i64 4607182418800017408
;
%r = load i64, i64* bitcast(double* @g2 to i64*)
ret i64 %r
}
; Load of double bits.
define i16 @test7() {
; LE-LABEL: @test7(
; LE-NEXT: ret i16 0
;
; BE-LABEL: @test7(
; BE-NEXT: ret i16 16368
;
%r = load i16, i16* bitcast(double* @g2 to i16*)
ret i16 %r
}
; Double load.
define double @test8() {
; LE-LABEL: @test8(
; LE-NEXT: ret double 0xBADEADBEEF
;
; BE-LABEL: @test8(
; BE-NEXT: ret double 0xDEADBEEFBA000000
;
%r = load double, double* bitcast({{i32,i8},i32}* @g1 to double*)
ret double %r
}
; i128 load.
define i128 @test9() {
; LE-LABEL: @test9(
; LE-NEXT: ret i128 2071796475790618158476296315
;
; BE-LABEL: @test9(
; BE-NEXT: ret i128 2268949521066387161080
;
%r = load i128, i128* bitcast({i64, i64}* @g3 to i128*)
ret i128 %r
}
; vector load.
define <2 x i64> @test10() {
; CHECK-LABEL: @test10(
; CHECK-NEXT: ret <2 x i64> <i64 123, i64 112312312>
;
%r = load <2 x i64>, <2 x i64>* bitcast({i64, i64}* @g3 to <2 x i64>*)
ret <2 x i64> %r
}
; PR5287
; { 0xA1, 0x08 }
@g4 = internal constant { i8, i8 } { i8 -95, i8 8 }
define i16 @test11() nounwind {
; LE-LABEL: @test11(
; LE-NEXT: entry:
; LE-NEXT: ret i16 2209
;
; BE-LABEL: @test11(
; BE-NEXT: entry:
; BE-NEXT: ret i16 -24312
;
entry:
%a = load i16, i16* bitcast ({ i8, i8 }* @g4 to i16*)
ret i16 %a
}
; PR5551
@test12g = private constant [6 x i8] c"a\00b\00\00\00"
define i16 @test12() {
; LE-LABEL: @test12(
; LE-NEXT: ret i16 98
;
; BE-LABEL: @test12(
; BE-NEXT: ret i16 25088
;
%a = load i16, i16* getelementptr inbounds ([3 x i16], [3 x i16]* bitcast ([6 x i8]* @test12g to [3 x i16]*), i32 0, i64 1)
ret i16 %a
}
; PR5978
@g5 = constant i8 4
define i1 @test13() {
; CHECK-LABEL: @test13(
; CHECK-NEXT: ret i1 false
;
%A = load i1, i1* bitcast (i8* @g5 to i1*)
ret i1 %A
}
@g6 = constant [2 x i8*] [i8* inttoptr (i64 1 to i8*), i8* inttoptr (i64 2 to i8*)]
define i64 @test14() nounwind {
; CHECK-LABEL: @test14(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i64 1
;
entry:
%tmp = load i64, i64* bitcast ([2 x i8*]* @g6 to i64*)
ret i64 %tmp
}
; Check with address space pointers
@g6_as1 = constant [2 x i8 addrspace(1)*] [i8 addrspace(1)* inttoptr (i16 1 to i8 addrspace(1)*), i8 addrspace(1)* inttoptr (i16 2 to i8 addrspace(1)*)]
define i16 @test14_as1() nounwind {
; CHECK-LABEL: @test14_as1(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i16 1
;
entry:
%tmp = load i16, i16* bitcast ([2 x i8 addrspace(1)*]* @g6_as1 to i16*)
ret i16 %tmp
}
define i64 @test15() nounwind {
; CHECK-LABEL: @test15(
; CHECK-NEXT: entry:
; CHECK-NEXT: ret i64 2
;
entry:
%tmp = load i64, i64* bitcast (i8** getelementptr inbounds ([2 x i8*], [2 x i8*]* @g6, i32 0, i64 1) to i64*)
ret i64 %tmp
}
@gv7 = constant [4 x i8*] [i8* null, i8* inttoptr (i64 -14 to i8*), i8* null, i8* null]
define i64 @test16.1() {
; CHECK-LABEL: @test16.1(
; CHECK-NEXT: ret i64 0
;
%v = load i64, i64* bitcast ([4 x i8*]* @gv7 to i64*), align 8
ret i64 %v
}
define i64 @test16.2() {
; CHECK-LABEL: @test16.2(
; CHECK-NEXT: ret i64 -14
;
%v = load i64, i64* bitcast (i8** getelementptr inbounds ([4 x i8*], [4 x i8*]* @gv7, i64 0, i64 1) to i64*), align 8
ret i64 %v
}
define i64 @test16.3() {
; CHECK-LABEL: @test16.3(
; CHECK-NEXT: ret i64 0
;
%v = load i64, i64* bitcast (i8** getelementptr inbounds ([4 x i8*], [4 x i8*]* @gv7, i64 0, i64 2) to i64*), align 8
ret i64 %v
}
@g7 = constant {[0 x i32], [0 x i8], {}*} { [0 x i32] undef, [0 x i8] undef, {}* null }
define i64* @test_leading_zero_size_elems() {
; CHECK-LABEL: @test_leading_zero_size_elems(
; CHECK-NEXT: ret i64* null
;
%v = load i64*, i64** bitcast ({[0 x i32], [0 x i8], {}*}* @g7 to i64**)
ret i64* %v
}
@g8 = constant {[4294967295 x [0 x i32]], i64} { [4294967295 x [0 x i32]] undef, i64 123 }
define i64 @test_leading_zero_size_elems_big() {
; CHECK-LABEL: @test_leading_zero_size_elems_big(
; CHECK-NEXT: ret i64 123
;
%v = load i64, i64* bitcast ({[4294967295 x [0 x i32]], i64}* @g8 to i64*)
ret i64 %v
}
@g9 = constant [4294967295 x [0 x i32]] zeroinitializer
define i64 @test_array_of_zero_size_array() {
; CHECK-LABEL: @test_array_of_zero_size_array(
; CHECK-NEXT: ret i64 undef
;
%v = load i64, i64* bitcast ([4294967295 x [0 x i32]]* @g9 to i64*)
ret i64 %v
}
@g10 = constant {i128} {i128 undef}
define i32* @test_undef_aggregate() {
; CHECK-LABEL: @test_undef_aggregate(
; CHECK-NEXT: ret i32* undef
;
%v = load i32*, i32** bitcast ({i128}* @g10 to i32**)
ret i32* %v
}
@g11 = constant <{ [8 x i8], [8 x i8] }> <{ [8 x i8] undef, [8 x i8] zeroinitializer }>, align 4
define {}* @test_trailing_zero_gep_index() {
; CHECK-LABEL: @test_trailing_zero_gep_index(
; CHECK-NEXT: ret {}* null
;
%v = load {}*, {}** bitcast (i8* getelementptr inbounds (<{ [8 x i8], [8 x i8] }>, <{ [8 x i8], [8 x i8] }>* @g11, i32 0, i32 1, i32 0) to {}**), align 4
ret {}* %v
}
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