ce8928f2e4
This is the first of two patches to address PR46753. We basically allow mem2reg to promote allocas that are used in doppable instructions, for now that means `llvm.assume`. The uses of the alloca (or a bitcast or zero offset GEP from there) are replaced by `undef` in the droppable instructions. Reviewed By: Tyker Differential Revision: https://reviews.llvm.org/D83976
86 lines
3.7 KiB
LLVM
86 lines
3.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -mem2reg -S -o - < %s | FileCheck %s
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; RUN: opt -passes=mem2reg -S -o - < %s | FileCheck %s
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declare void @llvm.assume(i1)
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declare void @llvm.lifetime.start.p0i8(i64 %size, i8* nocapture %ptr)
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declare void @llvm.lifetime.end.p0i8(i64 %size, i8* nocapture %ptr)
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define void @positive_assume_uses(i32* %arg) {
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; CHECK-LABEL: @positive_assume_uses(
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "nonnull"(i32* [[ARG:%.*]]), "ignore"(i32* undef, i64 2) ]
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"(i32* undef, i64 8), "nonnull"(i32* [[ARG]]) ]
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; CHECK-NEXT: ret void
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;
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%A = alloca i32
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call void @llvm.assume(i1 true) ["nonnull"(i32* %arg), "align"(i32* %A, i64 2)]
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store i32 1, i32* %A
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call void @llvm.assume(i1 true) ["align"(i32* %A, i64 8), "nonnull"(i32* %arg)]
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ret void
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}
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define void @negative_assume_condition_use() {
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; CHECK-LABEL: @negative_assume_condition_use(
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; CHECK-NEXT: [[A:%.*]] = alloca i32, align 4
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; CHECK-NEXT: [[B:%.*]] = bitcast i32* [[A]] to i8*
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; CHECK-NEXT: [[CND:%.*]] = icmp eq i8* [[B]], null
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; CHECK-NEXT: call void @llvm.assume(i1 [[CND]])
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; CHECK-NEXT: store i32 1, i32* [[A]], align 4
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; CHECK-NEXT: ret void
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;
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%A = alloca i32
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%B = bitcast i32* %A to i8*
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%cnd = icmp eq i8* %B, null
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call void @llvm.assume(i1 %cnd)
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store i32 1, i32* %A
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ret void
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}
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define void @positive_multiple_assume_uses() {
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; CHECK-LABEL: @positive_multiple_assume_uses(
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"({ i8, i16 }* undef, i64 8), "ignore"({ i8, i16 }* undef, i64 16) ]
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"({ i8, i16 }* undef), "ignore"({ i8, i16 }* undef, i64 2) ]
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; CHECK-NEXT: ret void
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;
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%A = alloca {i8, i16}
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call void @llvm.assume(i1 true) ["align"({i8, i16}* %A, i64 8), "align"({i8, i16}* %A, i64 16)]
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store {i8, i16} zeroinitializer, {i8, i16}* %A
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call void @llvm.assume(i1 true) ["nonnull"({i8, i16}* %A), "align"({i8, i16}* %A, i64 2)]
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ret void
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}
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define void @positive_gep_assume_uses() {
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; CHECK-LABEL: @positive_gep_assume_uses(
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"(i8* undef, i64 8), "ignore"(i8* undef, i64 16) ]
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"(i8* undef), "ignore"(i8* undef, i64 2) ]
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; CHECK-NEXT: ret void
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;
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%A = alloca {i8, i16}
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%B = getelementptr {i8, i16}, {i8, i16}* %A, i32 0, i32 0
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call void @llvm.lifetime.start.p0i8(i64 2, i8* %B)
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call void @llvm.assume(i1 true) ["align"(i8* %B, i64 8), "align"(i8* %B, i64 16)]
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store {i8, i16} zeroinitializer, {i8, i16}* %A
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call void @llvm.lifetime.end.p0i8(i64 2, i8* %B)
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call void @llvm.assume(i1 true) ["nonnull"(i8* %B), "align"(i8* %B, i64 2)]
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ret void
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}
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define void @positive_mixed_assume_uses() {
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; CHECK-LABEL: @positive_mixed_assume_uses(
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"(i8* undef), "ignore"(i8* undef, i64 8), "ignore"(i8* undef, i64 16) ]
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"(i8* undef), "ignore"(i8* undef, i64 2), "ignore"(i8* undef) ]
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; CHECK-NEXT: call void @llvm.assume(i1 true) [ "ignore"(i32* undef), "ignore"(i32* undef, i64 2), "ignore"(i8* undef) ]
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; CHECK-NEXT: ret void
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;
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%A = alloca i8
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%B = getelementptr i8, i8* %A, i32 0
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%C = bitcast i8* %A to i32*
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call void @llvm.lifetime.start.p0i8(i64 2, i8* %B)
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call void @llvm.assume(i1 true) ["nonnull"(i8* %B), "align"(i8* %A, i64 8), "align"(i8* %B, i64 16)]
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store i8 1, i8* %A
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call void @llvm.lifetime.end.p0i8(i64 2, i8* %B)
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call void @llvm.assume(i1 true) ["nonnull"(i8* %B), "align"(i8* %A, i64 2), "nonnull"(i8* %A)]
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call void @llvm.assume(i1 true) ["nonnull"(i32* %C), "align"(i32* %C, i64 2), "nonnull"(i8* %A)]
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ret void
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}
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