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Add several testcases for new optimizations in the code generator.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19244 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-01-02 02:30:04 +00:00
parent aad75aa1a2
commit ae37c2a543
3 changed files with 62 additions and 0 deletions
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21
test/CodeGen/X86/commute-two-addr.ll Normal file
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; The register allocator can commute two-address instructions to avoid
; insertion of register-register copies.
; Check that there are no register-register copies left.
; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X'
%G = external global int
declare void %ext(int)
int %add_test(int %X, int %Y) {
%Z = add int %X, %Y ;; Last use of Y, but not of X.
store int %Z, int* %G
ret int %X
}
int %xor_test(int %X, int %Y) {
%Z = xor int %X, %Y ;; Last use of Y, but not of X.
store int %Z, int* %G
ret int %X
}

24
test/CodeGen/X86/overlap-add.ll Normal file
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;; X's live range extends beyond the shift, so the register allocator
;; cannot coallesce it with Y. Because of this, a copy needs to be
;; emitted before the shift to save the register value before it is
;; clobbered. However, this copy is not needed if the register
;; allocator turns the shift into an LEA. This also occurs for ADD.
; Check that the shift gets turned into an LEA.
; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X'
%G = external global int
int %test1(int %X, int %Y) {
%Z = add int %X, %Y
volatile store int %Y, int* %G
volatile store int %Z, int* %G
ret int %X
}
int %test2(int %X) {
%Z = add int %X, 1 ;; inc
volatile store int %Z, int* %G
ret int %X
}

17
test/CodeGen/X86/overlap-shift.ll Normal file
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;; X's live range extends beyond the shift, so the register allocator
;; cannot coallesce it with Y. Because of this, a copy needs to be
;; emitted before the shift to save the register value before it is
;; clobbered. However, this copy is not needed if the register
;; allocator turns the shift into an LEA. This also occurs for ADD.
; Check that the shift gets turned into an LEA.
; RUN: llvm-as < %s | llc -march=x86 -x86-asm-syntax=intel | not grep 'mov %E.X, %E.X'
%G = external global int
int %test1(int %X) {
%Z = shl int %X, ubyte 2
volatile store int %Z, int* %G
ret int %X
}