[llvm] r352272 - [X86] Add 'less_than_ideal' followup test case from PR24545
Simon Pilgrim via llvm-commits
llvm-commits at lists.llvm.org
Sat Jan 26 04:51:52 PST 2019
Author: rksimon
Date: Sat Jan 26 04:51:52 2019
New Revision: 352272
URL: http://llvm.org/viewvc/llvm-project?rev=352272&view=rev
Log:
[X86] Add 'less_than_ideal' followup test case from PR24545
Modified:
llvm/trunk/test/CodeGen/X86/combine-sbb.ll
Modified: llvm/trunk/test/CodeGen/X86/combine-sbb.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/CodeGen/X86/combine-sbb.ll?rev=352272&r1=352271&r2=352272&view=diff
==============================================================================
--- llvm/trunk/test/CodeGen/X86/combine-sbb.ll (original)
+++ llvm/trunk/test/CodeGen/X86/combine-sbb.ll Sat Jan 26 04:51:52 2019
@@ -122,3 +122,38 @@ top:
}
declare { i64, i1 } @llvm.usub.with.overflow.i64(i64, i64)
+
+; PR24545 less_than_ideal()
+define i8 @PR24545(i32, i32, i32* nocapture readonly) {
+; X86-LABEL: PR24545:
+; X86: # %bb.0:
+; X86-NEXT: movl {{[0-9]+}}(%esp), %eax
+; X86-NEXT: movl {{[0-9]+}}(%esp), %ecx
+; X86-NEXT: movl (%ecx), %edx
+; X86-NEXT: cmpl {{[0-9]+}}(%esp), %edx
+; X86-NEXT: seta %dl
+; X86-NEXT: addb $-1, %dl
+; X86-NEXT: sbbl 4(%ecx), %eax
+; X86-NEXT: setb %al
+; X86-NEXT: retl
+;
+; X64-LABEL: PR24545:
+; X64: # %bb.0:
+; X64-NEXT: cmpl %edi, (%rdx)
+; X64-NEXT: seta %al
+; X64-NEXT: addb $-1, %al
+; X64-NEXT: sbbl 4(%rdx), %esi
+; X64-NEXT: setb %al
+; X64-NEXT: retq
+ %4 = load i32, i32* %2
+ %5 = icmp ugt i32 %4, %0
+ %6 = zext i1 %5 to i8
+ %7 = getelementptr inbounds i32, i32* %2, i32 1
+ %8 = load i32, i32* %7
+ %9 = tail call { i8, i32 } @llvm.x86.subborrow.32(i8 %6, i32 %1, i32 %8)
+ %10 = extractvalue { i8, i32 } %9, 0
+ %11 = icmp ne i8 %10, 0
+ %12 = zext i1 %11 to i8
+ ret i8 %12
+}
+declare { i8, i32 } @llvm.x86.subborrow.32(i8, i32, i32)
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