6697e3354f
If we're not relying on the flag result, we can fold the constants together into the RHS immediate operand and set the LHS operand to zero, simplifying for further folds. We could do something similar if the flag result is in use and the constant fold doesn't affect it, but I don't have any real test cases for this yet. As suggested by @davezarzycki on Issue #35256 Differential Revision: https://reviews.llvm.org/D122482
29 lines
927 B
LLVM
29 lines
927 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -mtriple=i386-unknown-linux-gnu -mcpu=corei7-avx -enable-misched=false | FileCheck %s
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define i64 @main(i1 %tobool1) nounwind {
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; CHECK-LABEL: main:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: testb $1, {{[0-9]+}}(%esp)
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; CHECK-NEXT: movl $-12, %ecx
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; CHECK-NEXT: movl $-1, %eax
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; CHECK-NEXT: cmovnel %ecx, %eax
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; CHECK-NEXT: xorl %ecx, %ecx
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; CHECK-NEXT: movl %eax, %edx
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; CHECK-NEXT: addl $-1, %edx
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; CHECK-NEXT: movl $0, %edx
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; CHECK-NEXT: adcl $-2, %edx
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; CHECK-NEXT: cmovsl %ecx, %eax
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; CHECK-NEXT: xorl %edx, %edx
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; CHECK-NEXT: retl
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entry:
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%0 = zext i1 %tobool1 to i32
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%. = xor i32 %0, 1
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%.21 = select i1 %tobool1, i32 -12, i32 -1
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%conv = sext i32 %.21 to i64
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%1 = add i64 %conv, -1
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%cmp10 = icmp slt i64 %1, 0
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%sub17 = select i1 %cmp10, i64 0, i64 %conv
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ret i64 %sub17
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}
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