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7b0a985247
The previous change to local live range allocation also suppressed eviction of local ranges. In rare cases, this could result in more expensive register choices. This commit actually revives a feature that I added long ago: check if live ranges can be reassigned before eviction. But now it only happens in rare cases of evicting a local live range because another local live range wants a cheaper register. The benefit is improved code size for some benchmarks on x86 and armv7. I measured no significant compile time increase and performance changes are noise. llvm-svn: 187140
67 lines
1.5 KiB
LLVM
67 lines
1.5 KiB
LLVM
; RUN: llc -mcpu=generic -mtriple=i686-unknown-unknown < %s | FileCheck %s
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define i64 @test1(i32 %xx, i32 %test) nounwind {
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%conv = zext i32 %xx to i64
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%and = and i32 %test, 7
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%sh_prom = zext i32 %and to i64
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%shl = shl i64 %conv, %sh_prom
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ret i64 %shl
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; CHECK-LABEL: test1:
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; CHECK: shll %cl, %eax
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; CHECK: shrl %edx
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; CHECK: xorb $31
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; CHECK: shrl %cl, %edx
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}
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define i64 @test2(i64 %xx, i32 %test) nounwind {
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%and = and i32 %test, 7
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%sh_prom = zext i32 %and to i64
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%shl = shl i64 %xx, %sh_prom
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ret i64 %shl
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; CHECK-LABEL: test2:
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; CHECK: shll %cl, %esi
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; CHECK: shrl %edx
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; CHECK: xorb $31
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; CHECK: shrl %cl, %edx
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; CHECK: orl %esi, %edx
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; CHECK: shll %cl, %eax
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}
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define i64 @test3(i64 %xx, i32 %test) nounwind {
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%and = and i32 %test, 7
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%sh_prom = zext i32 %and to i64
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%shr = lshr i64 %xx, %sh_prom
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ret i64 %shr
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; CHECK-LABEL: test3:
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; CHECK: shrl %cl, %esi
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; CHECK: leal (%edx,%edx), %eax
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; CHECK: xorb $31, %cl
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; CHECK: shll %cl, %eax
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; CHECK: orl %esi, %eax
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; CHECK: shrl %cl, %edx
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}
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define i64 @test4(i64 %xx, i32 %test) nounwind {
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%and = and i32 %test, 7
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%sh_prom = zext i32 %and to i64
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%shr = ashr i64 %xx, %sh_prom
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ret i64 %shr
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; CHECK-LABEL: test4:
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; CHECK: shrl %cl, %esi
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; CHECK: leal (%edx,%edx), %eax
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; CHECK: xorb $31, %cl
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; CHECK: shll %cl, %eax
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; CHECK: orl %esi, %eax
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; CHECK: sarl %cl, %edx
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}
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; PR14668
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define <2 x i64> @test5(<2 x i64> %A, <2 x i64> %B) {
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%shl = shl <2 x i64> %A, %B
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ret <2 x i64> %shl
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; CHECK: test5
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; CHECK: shl
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; CHECK: shldl
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; CHECK: shl
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; CHECK: shldl
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}
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