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[gvn] PRE needs to skip convergent intrinsics/calls.
- As convergent intrinsics/calls could only be moved to control-equivalent blocks, or more precisely the same divergent branch, PRE needs to skip them. Differential Revision: https://reviews.llvm.org/D90391
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py | ||
; RUN: opt -S -gvn -o - %s | FileCheck %s | ||
; RUN: opt -S -passes=gvn -o - %s | FileCheck %s | ||
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define i32 @foo(i1 %cond, i32* %q, i32* %p) { | ||
; CHECK-LABEL: @foo( | ||
; CHECK-NEXT: entry: | ||
; CHECK-NEXT: [[V0:%.*]] = call i32 @llvm.convergent(i32 0) | ||
; CHECK-NEXT: store i32 [[V0]], i32* [[Q:%.*]], align 4 | ||
; CHECK-NEXT: br i1 [[COND:%.*]], label [[PRE:%.*]], label [[MERGE:%.*]] | ||
; CHECK: pre: | ||
; CHECK-NEXT: [[T0:%.*]] = load i32, i32* [[P:%.*]], align 4 | ||
; CHECK-NEXT: br label [[MERGE]] | ||
; CHECK: merge: | ||
; CHECK-NEXT: [[M0:%.*]] = phi i32 [ [[T0]], [[PRE]] ], [ 0, [[ENTRY:%.*]] ] | ||
; CHECK-NEXT: [[R0:%.*]] = call i32 @llvm.convergent(i32 [[M0]]) | ||
; CHECK-NEXT: ret i32 [[R0]] | ||
; | ||
entry: | ||
%v0 = call i32 @llvm.convergent(i32 0) | ||
store i32 %v0, i32* %q | ||
br i1 %cond, label %pre, label %merge | ||
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pre: | ||
%t0 = load i32, i32* %p | ||
br label %merge | ||
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merge: | ||
%m0 = phi i32 [ %t0, %pre ], [ 0, %entry ] | ||
%r0 = call i32 @llvm.convergent(i32 %m0) | ||
ret i32 %r0 | ||
} | ||
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declare i32 @llvm.convergent(i32) #0 | ||
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attributes #0 = { convergent nounwind readnone } |