X86: Lower a select directly to a setcc_carry if possible.
int test(unsigned long a, unsigned long b) { return -(a < b); }
compiles to
_test: ## @test
cmpq %rsi, %rdi ## encoding: [0x48,0x39,0xf7]
sbbl %eax, %eax ## encoding: [0x19,0xc0]
ret ## encoding: [0xc3]
instead of
_test: ## @test
xorl %ecx, %ecx ## encoding: [0x31,0xc9]
cmpq %rsi, %rdi ## encoding: [0x48,0x39,0xf7]
movl $-1, %eax ## encoding: [0xb8,0xff,0xff,0xff,0xff]
cmovael %ecx, %eax ## encoding: [0x0f,0x43,0xc1]
ret ## encoding: [0xc3]
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122451 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/test/CodeGen/X86/select.ll b/test/CodeGen/X86/select.ll
index 9df23f1..ce04e07 100644
--- a/test/CodeGen/X86/select.ll
+++ b/test/CodeGen/X86/select.ll
@@ -197,7 +197,24 @@
declare { i64, i1 } @llvm.umul.with.overflow.i64(i64, i64) nounwind readnone
+define i32 @test13(i32 %a, i32 %b) nounwind {
+ %c = icmp ult i32 %a, %b
+ %d = sext i1 %c to i32
+ ret i32 %d
+; CHECK: test13:
+; CHECK: cmpl
+; CHECK-NEXT: sbbl
+; CHECK-NEXT: ret
+}
-
-
+define i32 @test14(i32 %a, i32 %b) nounwind {
+ %c = icmp uge i32 %a, %b
+ %d = sext i1 %c to i32
+ ret i32 %d
+; CHECK: test14:
+; CHECK: cmpl
+; CHECK-NEXT: sbbl
+; CHECK-NEXT: notl
+; CHECK-NEXT: ret
+}