mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-30 02:32:08 +00:00
7d6fe13efc
(add Y, (sete X, 0)) -> cmp X, 1; adc 0, Y
(add Y, (setne X, 0)) -> cmp X, 1; sbb -1, Y
(sub (sete X, 0), Y) -> cmp X, 1; sbb 0, Y
(sub (setne X, 0), Y) -> cmp X, 1; adc -1, Y
for
unsigned foo(unsigned a, unsigned b) {
if (a == 0) b++;
return b;
}
we now get:
foo:
cmpl $1, %edi
movl %esi, %eax
adcl $0, %eax
ret
instead of:
foo:
testl %edi, %edi
sete %al
movzbl %al, %eax
addl %esi, %eax
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122364 91177308-0d34-0410-b5e6-96231b3b80d8
90 lines
1.8 KiB
LLVM
90 lines
1.8 KiB
LLVM
; RUN: llc -march=x86 < %s | FileCheck %s
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define i32 @test1(i32 %a, i32 %b) nounwind readnone {
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%not.cmp = icmp ne i32 %a, 0
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%inc = zext i1 %not.cmp to i32
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%retval.0 = add i32 %inc, %b
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ret i32 %retval.0
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; CHECK: test1:
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; CHECK: cmpl $1
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; CHECK: sbbl $-1
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; CHECK: ret
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}
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define i32 @test2(i32 %a, i32 %b) nounwind readnone {
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%cmp = icmp eq i32 %a, 0
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%inc = zext i1 %cmp to i32
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%retval.0 = add i32 %inc, %b
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ret i32 %retval.0
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; CHECK: test2:
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; CHECK: cmpl $1
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; CHECK: adcl $0
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; CHECK: ret
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}
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define i32 @test3(i32 %a, i32 %b) nounwind readnone {
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%cmp = icmp eq i32 %a, 0
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%inc = zext i1 %cmp to i32
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%retval.0 = add i32 %inc, %b
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ret i32 %retval.0
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; CHECK: test3:
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; CHECK: cmpl $1
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; CHECK: adcl $0
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; CHECK: ret
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}
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define i32 @test4(i32 %a, i32 %b) nounwind readnone {
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%not.cmp = icmp ne i32 %a, 0
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%inc = zext i1 %not.cmp to i32
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%retval.0 = add i32 %inc, %b
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ret i32 %retval.0
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; CHECK: test4:
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; CHECK: cmpl $1
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; CHECK: sbbl $-1
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; CHECK: ret
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}
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define i32 @test5(i32 %a, i32 %b) nounwind readnone {
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%not.cmp = icmp ne i32 %a, 0
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%inc = zext i1 %not.cmp to i32
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%retval.0 = sub i32 %b, %inc
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ret i32 %retval.0
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; CHECK: test5:
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; CHECK: cmpl $1
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; CHECK: adcl $-1
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; CHECK: ret
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}
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define i32 @test6(i32 %a, i32 %b) nounwind readnone {
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%cmp = icmp eq i32 %a, 0
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%inc = zext i1 %cmp to i32
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%retval.0 = sub i32 %b, %inc
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ret i32 %retval.0
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; CHECK: test6:
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; CHECK: cmpl $1
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; CHECK: sbbl $0
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; CHECK: ret
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}
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define i32 @test7(i32 %a, i32 %b) nounwind readnone {
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%cmp = icmp eq i32 %a, 0
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%inc = zext i1 %cmp to i32
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%retval.0 = sub i32 %b, %inc
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ret i32 %retval.0
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; CHECK: test7:
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; CHECK: cmpl $1
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; CHECK: sbbl $0
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; CHECK: ret
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}
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define i32 @test8(i32 %a, i32 %b) nounwind readnone {
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%not.cmp = icmp ne i32 %a, 0
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%inc = zext i1 %not.cmp to i32
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%retval.0 = sub i32 %b, %inc
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ret i32 %retval.0
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; CHECK: test8:
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; CHECK: cmpl $1
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; CHECK: adcl $-1
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; CHECK: ret
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}
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