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28 lines
822 B
LLVM
28 lines
822 B
LLVM
;; X's live range extends beyond the shift, so the register allocator
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;; cannot coallesce it with Y. Because of this, a copy needs to be
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;; emitted before the shift to save the register value before it is
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;; clobbered. However, this copy is not needed if the register
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;; allocator turns the shift into an LEA. This also occurs for ADD.
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; Check that the shift gets turned into an LEA.
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; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X'
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; FIXME: We need live variable information about flags to do this xform safely. :(
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; XFAIL: *
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%G = external global int
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int %test1(int %X, int %Y) {
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%Z = add int %X, %Y
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volatile store int %Y, int* %G
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volatile store int %Z, int* %G
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ret int %X
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}
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int %test2(int %X) {
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%Z = add int %X, 1 ;; inc
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volatile store int %Z, int* %G
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ret int %X
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}
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