[llvm] 0d814ca - [X86] Add test for PR49587 (NFC)
Nikita Popov via llvm-commits
llvm-commits at lists.llvm.org
Sun Mar 14 08:40:26 PDT 2021
Author: Nikita Popov
Date: 2021-03-14T16:39:49+01:00
New Revision: 0d814ca0f02733d6581bf209fadbebf3035380e0
URL: https://github.com/llvm/llvm-project/commit/0d814ca0f02733d6581bf209fadbebf3035380e0
DIFF: https://github.com/llvm/llvm-project/commit/0d814ca0f02733d6581bf209fadbebf3035380e0.diff
LOG: [X86] Add test for PR49587 (NFC)
Shows a miscompile with FastISel.
Added:
llvm/test/CodeGen/X86/pr49587.ll
Modified:
Removed:
################################################################################
diff --git a/llvm/test/CodeGen/X86/pr49587.ll b/llvm/test/CodeGen/X86/pr49587.ll
new file mode 100644
index 0000000000000..343f1a0149c04
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pr49587.ll
@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -O0 -fast-isel -mtriple=x86_64-- < %s | FileCheck %s
+
+define i32 @test(i64 %arg) nounwind {
+; CHECK-LABEL: test:
+; CHECK: # %bb.0: # %entry
+; CHECK-NEXT: subq $1, %rdi
+; CHECK-NEXT: setb %al
+; CHECK-NEXT: xorl %eax, %eax
+; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
+; CHECK-NEXT: jb .LBB0_2
+; CHECK-NEXT: # %bb.1: # %no_overflow
+; CHECK-NEXT: movl $1, %eax
+; CHECK-NEXT: movl %eax, {{[-0-9]+}}(%r{{[sb]}}p) # 4-byte Spill
+; CHECK-NEXT: jmp .LBB0_2
+; CHECK-NEXT: .LBB0_2: # %merge
+; CHECK-NEXT: movl {{[-0-9]+}}(%r{{[sb]}}p), %eax # 4-byte Reload
+; CHECK-NEXT: retq
+entry:
+ %usubo = tail call { i64, i1 } @llvm.usub.with.overflow.i64(i64 %arg, i64 1)
+ %overflow = extractvalue { i64, i1 } %usubo, 1
+ br i1 %overflow, label %merge, label %no_overflow
+
+no_overflow:
+ br label %merge
+
+merge:
+ %phi = phi i32 [ 1, %no_overflow ], [ 0, %entry ]
+ ret i32 %phi
+}
+
+declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64)
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