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59c8d1af93
to catch cases like: %reg1024<def> = MOV r1 %reg1025<def> = MOV r0 %reg1026<def> = ADD %reg1024, %reg1025 r0 = MOV %reg1026 By commuting ADD, it let coalescer eliminate all of the copies. However, there was a bug in the heuristics where it ended up commuting the ADD in: %reg1024<def> = MOV r0 %reg1025<def> = MOV 0 %reg1026<def> = ADD %reg1024, %reg1025 r0 = MOV %reg1026 That did no benefit but rather ensure the last MOV would not be coalesced. rdar://11355268 llvm-svn: 156048
86 lines
1.7 KiB
LLVM
86 lines
1.7 KiB
LLVM
; RUN: llc < %s -march=x86 -mcpu=pentiumpro | FileCheck %s
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define i32 @f(i32 %X) {
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entry:
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; CHECK: f:
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; CHECK: jns
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%tmp1 = add i32 %X, 1 ; <i32> [#uses=1]
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%tmp = icmp slt i32 %tmp1, 0 ; <i1> [#uses=1]
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br i1 %tmp, label %cond_true, label %cond_next
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cond_true: ; preds = %entry
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%tmp2 = tail call i32 (...)* @bar( ) ; <i32> [#uses=0]
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br label %cond_next
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cond_next: ; preds = %cond_true, %entry
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%tmp3 = tail call i32 (...)* @baz( ) ; <i32> [#uses=0]
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ret i32 undef
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}
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declare i32 @bar(...)
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declare i32 @baz(...)
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; rdar://10633221
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; rdar://11355268
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define i32 @g(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: g:
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; CHECK-NOT: test
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; CHECK: cmovs
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%sub = sub nsw i32 %a, %b
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%cmp = icmp sgt i32 %sub, 0
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%cond = select i1 %cmp, i32 %sub, i32 0
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ret i32 %cond
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}
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; rdar://10734411
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define i32 @h(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: h:
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; CHECK-NOT: cmp
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; CHECK: cmov
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; CHECK-NOT: movl
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; CHECK: ret
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%cmp = icmp slt i32 %b, %a
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%sub = sub nsw i32 %a, %b
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%cond = select i1 %cmp, i32 %sub, i32 0
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ret i32 %cond
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}
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define i32 @i(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: i:
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; CHECK-NOT: cmp
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; CHECK: cmov
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; CHECK-NOT: movl
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; CHECK: ret
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%cmp = icmp sgt i32 %a, %b
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%sub = sub nsw i32 %a, %b
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%cond = select i1 %cmp, i32 %sub, i32 0
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ret i32 %cond
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}
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define i32 @j(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: j:
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; CHECK-NOT: cmp
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; CHECK: cmov
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; CHECK-NOT: movl
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; CHECK: ret
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%cmp = icmp ugt i32 %a, %b
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%sub = sub i32 %a, %b
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%cond = select i1 %cmp, i32 %sub, i32 0
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ret i32 %cond
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}
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define i32 @k(i32 %a, i32 %b) nounwind {
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entry:
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; CHECK: k:
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; CHECK-NOT: cmp
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; CHECK: cmov
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; CHECK-NOT: movl
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; CHECK: ret
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%cmp = icmp ult i32 %b, %a
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%sub = sub i32 %a, %b
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%cond = select i1 %cmp, i32 %sub, i32 0
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ret i32 %cond
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}
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