[llvm] [X86] Return true for opaque constants in hasAndNotCompare. (PR #92944)
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Tue May 21 11:01:19 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-x86
Author: Craig Topper (topperc)
<details>
<summary>Changes</summary>
This is the X86 equivalent of #<!-- -->92926
---
Full diff: https://github.com/llvm/llvm-project/pull/92944.diff
2 Files Affected:
- (modified) llvm/lib/Target/X86/X86ISelLowering.cpp (+1-1)
- (added) llvm/test/CodeGen/X86/pr90703.ll (+21)
``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 5d0846453685f..24ee0c45b6672 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -3292,7 +3292,7 @@ bool X86TargetLowering::hasAndNotCompare(SDValue Y) const {
if (VT != MVT::i32 && VT != MVT::i64)
return false;
- return !isa<ConstantSDNode>(Y);
+ return !isa<ConstantSDNode>(Y) || cast<ConstantSDNode>(Y)->isOpaque();
}
bool X86TargetLowering::hasAndNot(SDValue Y) const {
diff --git a/llvm/test/CodeGen/X86/pr90703.ll b/llvm/test/CodeGen/X86/pr90703.ll
new file mode 100644
index 0000000000000..c02342ffeec17
--- /dev/null
+++ b/llvm/test/CodeGen/X86/pr90703.ll
@@ -0,0 +1,21 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mattr=+bmi | FileCheck %s
+
+define i64 @pr90730(i64 %x, i64 %y, ptr %p) {
+; CHECK-LABEL: pr90730:
+; CHECK: # %bb.0: # %entry
+; CHECK-NEXT: movabsq $33181731808, %rax # imm = 0x7B9C90BE0
+; CHECK-NEXT: andnq %rax, %rdi, %rax
+; CHECK-NEXT: movq $0, (%rdx)
+; CHECK-NEXT: retq
+entry:
+ %ext = and i64 %y, 1
+ %xor1 = xor i64 %ext, 33181731817
+ %and1 = and i64 %xor1, %x
+ store i64 %and1, ptr %p, align 4
+ %v = load i64, ptr %p, align 4
+ %and2 = and i64 %v, 33181731808
+ %xor2 = xor i64 %and2, 33181731808
+ store i64 0, ptr %p, align 4
+ ret i64 %xor2
+}
``````````
</details>
https://github.com/llvm/llvm-project/pull/92944
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