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0f93413ef8
I'm hoping we can just replace SETCC_CARRY with SBB. This is another step towards that. I've explicitly used zero as the input to the setcc to avoid a false dependency that we've had with the SETCC_CARRY. I changed one of the patterns that used NEG to instead use an explicit compare with 0 on the LHS. We needed the zero anyway to avoid the false dependency. The negate would clobber its input register. By using a CMP we can avoid that which could be useful. Differential Revision: https://reviews.llvm.org/D55414 llvm-svn: 348959
42 lines
1.3 KiB
LLVM
42 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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;RUN: llc < %s | FileCheck %s
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; This test case failed on legalization of "shl" node. PR29058.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@structMember = external local_unnamed_addr global i64, align 8
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define i32 @PR29058(i8 %x, i32 %y) {
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; CHECK-LABEL: PR29058:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: movl %esi, %ecx
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; CHECK-NEXT: testb %dil, %dil
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; CHECK-NEXT: movl $2147483646, %eax # imm = 0x7FFFFFFE
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; CHECK-NEXT: cmovnel %esi, %eax
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; CHECK-NEXT: xorl %edx, %edx
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; CHECK-NEXT: cmpb $1, %dil
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; CHECK-NEXT: sbbb %dl, %dl
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; CHECK-NEXT: orb %dl, %cl
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; CHECK-NEXT: # kill: def $cl killed $cl killed $ecx
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; CHECK-NEXT: shll %cl, %eax
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; CHECK-NEXT: movq %rax, {{.*}}(%rip)
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; CHECK-NEXT: # kill: def $eax killed $eax killed $rax
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; CHECK-NEXT: retq
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entry:
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%bool_1 = icmp ne i8 %x, 0
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%bool_2 = icmp eq i8 %x, 0
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%0 = select i1 %bool_2, i32 2147483646, i32 %y
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%or_1 = select i1 %bool_1, i32 %y, i32 -1
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%shl_1 = shl i32 %0, %or_1
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%conv = zext i32 %shl_1 to i64
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store i64 %conv, i64* @structMember, align 8
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%tmp = select i1 %bool_2, i32 2147483646, i32 %y
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%lnot = icmp eq i8 %x, 0
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%or_2 = select i1 %lnot, i32 -1, i32 %y
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%shl_2 = shl i32 %tmp, %or_2
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ret i32 %shl_2
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}
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