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https://github.com/c64scene-ar/llvm-6502.git
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3bf15ced2b
To avoid problems with zero shifts when getting the bits that move between words we use a trick: first shift the by amount-1, then do another shift by one. When amount is 0 (and size 32) we first shift by 31, then by one, instead of by 32. Also fix a latent bug that emitted the low and high words in the wrong order when shifting right. Fixes PR12113. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151637 91177308-0d34-0410-b5e6-96231b3b80d8
57 lines
1.2 KiB
LLVM
57 lines
1.2 KiB
LLVM
; RUN: llc -march=x86 < %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: test1:
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; CHECK: shll %cl, %eax
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; CHECK: xorb $31
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; CHECK: shrl %cl, %edx
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; CHECK: shrl %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: test2:
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; CHECK: shll %cl, %esi
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; CHECK: xorb $31
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; CHECK: shrl %cl, %edx
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; CHECK: shrl %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: test3:
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; CHECK: shrl %cl, %esi
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; CHECK: xorb $31, %cl
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; CHECK: shll %cl, %eax
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; CHECK: addl %eax, %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: test4:
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; CHECK: shrl %cl, %esi
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; CHECK: xorb $31, %cl
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; CHECK: shll %cl, %eax
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; CHECK: addl %eax, %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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