Add several testcases for new optimizations in the code generator.

llvm-svn: 19244
This commit is contained in:
Chris Lattner 2005-01-02 02:30:04 +00:00
parent 2aef5783b0
commit 2cfe515d2b
3 changed files with 62 additions and 0 deletions

@ -0,0 +1,21 @@
; 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
}

@ -0,0 +1,24 @@
;; 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
}

@ -0,0 +1,17 @@
;; 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
}