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https://github.com/c64scene-ar/llvm-6502.git
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540cda34b0
More condition codes are included when deciding whether to remove cmp after a sub instruction. Specifically, we extend from GE|LT|GT|LE to GE|LT|GT|LE|HS|LS|HI|LO|EQ|NE. If we have "sub a, b; cmp b, a; movhs", we should be able to replace with "sub a, b; movls". rdar: 11725965 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159166 91177308-0d34-0410-b5e6-96231b3b80d8
47 lines
931 B
LLVM
47 lines
931 B
LLVM
; RUN: llc < %s -mtriple=arm-apple-darwin | FileCheck %s
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define i32 @f(i32 %a, i32 %b) nounwind ssp {
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entry:
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; CHECK: f:
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; CHECK: subs
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; CHECK-NOT: cmp
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%cmp = icmp sgt i32 %a, %b
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%sub = sub nsw i32 %a, %b
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%sub. = select i1 %cmp, i32 %sub, i32 0
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ret i32 %sub.
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}
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define i32 @g(i32 %a, i32 %b) nounwind ssp {
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entry:
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; CHECK: g:
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; CHECK: subs
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; CHECK-NOT: cmp
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%cmp = icmp slt i32 %a, %b
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%sub = sub nsw i32 %b, %a
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%sub. = select i1 %cmp, i32 %sub, i32 0
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ret i32 %sub.
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}
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define i32 @h(i32 %a, i32 %b) nounwind ssp {
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entry:
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; CHECK: h:
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; CHECK: subs
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; CHECK-NOT: cmp
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%cmp = icmp sgt i32 %a, 3
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%sub = sub nsw i32 %a, 3
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%sub. = select i1 %cmp, i32 %sub, i32 %b
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ret i32 %sub.
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}
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; rdar://11725965
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define i32 @i(i32 %a, i32 %b) nounwind readnone ssp {
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entry:
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; CHECK: i:
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; CHECK: subs
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; CHECK-NOT: cmp
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%cmp = icmp ult i32 %a, %b
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%sub = sub i32 %b, %a
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%sub. = select i1 %cmp, i32 %sub, i32 0
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ret i32 %sub.
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}
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