9aa1428174
We can look through invariant group intrinsics for the purposes of simplifying the result of a load. Since intrinsics can't be constants, but we also don't want to completely rewrite load constant folding, we convert the load operand to a constant. For GEPs and bitcasts we just treat them as constants. For invariant group intrinsics, we treat them as a bitcast. Relanding with a check for self-referential values. Reviewed By: lebedev.ri Differential Revision: https://reviews.llvm.org/D101103
81 lines
2.7 KiB
LLVM
81 lines
2.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instsimplify -S < %s | FileCheck %s
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@A = linkonce_odr hidden constant { i64, i64 } { i64 2, i64 3 }
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@B = linkonce_odr hidden global { i64, i64 } { i64 2, i64 3 }
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declare i8* @llvm.strip.invariant.group.p0i8(i8* %p)
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declare i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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define i64 @f() {
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; CHECK-LABEL: @f(
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; CHECK-NEXT: ret i64 3
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;
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%p = bitcast { i64, i64 }* @A to i8*
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%a = call i8* @llvm.strip.invariant.group.p0i8(i8* %p)
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%b = getelementptr i8, i8* %a, i32 8
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%c = bitcast i8* %b to i64*
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%d = load i64, i64* %c
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ret i64 %d
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}
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define i64 @g() {
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; CHECK-LABEL: @g(
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; CHECK-NEXT: ret i64 3
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;
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%p = bitcast { i64, i64 }* @A to i8*
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%a = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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%b = getelementptr i8, i8* %a, i32 8
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%c = bitcast i8* %b to i64*
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%d = load i64, i64* %c
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ret i64 %d
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}
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define i64 @notconstantglobal() {
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; CHECK-LABEL: @notconstantglobal(
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; CHECK-NEXT: [[A:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* bitcast ({ i64, i64 }* @B to i8*))
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; CHECK-NEXT: [[B:%.*]] = getelementptr i8, i8* [[A]], i32 8
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; CHECK-NEXT: [[C:%.*]] = bitcast i8* [[B]] to i64*
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; CHECK-NEXT: [[D:%.*]] = load i64, i64* [[C]], align 4
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; CHECK-NEXT: ret i64 [[D]]
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;
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%p = bitcast { i64, i64 }* @B to i8*
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%a = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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%b = getelementptr i8, i8* %a, i32 8
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%c = bitcast i8* %b to i64*
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%d = load i64, i64* %c
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ret i64 %d
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}
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define i64 @notconstantgepindex(i32 %i) {
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; CHECK-LABEL: @notconstantgepindex(
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; CHECK-NEXT: [[A:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* bitcast ({ i64, i64 }* @A to i8*))
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; CHECK-NEXT: [[B:%.*]] = getelementptr i8, i8* [[A]], i32 [[I:%.*]]
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; CHECK-NEXT: [[C:%.*]] = bitcast i8* [[B]] to i64*
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; CHECK-NEXT: [[D:%.*]] = load i64, i64* [[C]], align 4
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; CHECK-NEXT: ret i64 [[D]]
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;
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%p = bitcast { i64, i64 }* @A to i8*
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%a = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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%b = getelementptr i8, i8* %a, i32 %i
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%c = bitcast i8* %b to i64*
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%d = load i64, i64* %c
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ret i64 %d
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}
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define i64 @volatile() {
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; CHECK-LABEL: @volatile(
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; CHECK-NEXT: [[A:%.*]] = call i8* @llvm.launder.invariant.group.p0i8(i8* bitcast ({ i64, i64 }* @A to i8*))
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; CHECK-NEXT: [[B:%.*]] = getelementptr i8, i8* [[A]], i32 8
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; CHECK-NEXT: [[C:%.*]] = bitcast i8* [[B]] to i64*
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; CHECK-NEXT: [[D:%.*]] = load volatile i64, i64* [[C]], align 4
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; CHECK-NEXT: ret i64 [[D]]
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;
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%p = bitcast { i64, i64 }* @A to i8*
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%a = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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%b = getelementptr i8, i8* %a, i32 8
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%c = bitcast i8* %b to i64*
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%d = load volatile i64, i64* %c
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ret i64 %d
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}
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