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| author | Chris Lattner <sabre@nondot.org> | 2004-04-01 04:06:09 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2004-04-01 04:06:09 +0000 |
| commit | 0526f01fec0945eca49ccd91f22a93af6bb71c17 (patch) | |
| tree | df125c09c70d13daafc35c5c681710f99ff9f1cd /lib/Transforms/Utils/DemoteRegToStack.cpp | |
| parent | f1ac50ec53889a4cf16ddc80907edc54119360d0 (diff) | |
Simplify code by using the more powerful BuildMI forms.
Implement a small optimization. In test/Regression/CodeGen/X86/select.ll,
we now generate this for foldSel3:
foldSel3:
mov %AL, BYTE PTR [%ESP + 4]
fld DWORD PTR [%ESP + 8]
fld DWORD PTR [%ESP + 12]
mov %EAX, DWORD PTR [%ESP + 16]
mov %ECX, DWORD PTR [%ESP + 20]
cmp %EAX, %ECX
fxch %ST(1)
fcmovae %ST(0), %ST(1)
*** fstp %ST(1)
ret
Instead of:
foldSel3:
mov %AL, BYTE PTR [%ESP + 4]
fld DWORD PTR [%ESP + 8]
fld DWORD PTR [%ESP + 12]
mov %EAX, DWORD PTR [%ESP + 16]
mov %ECX, DWORD PTR [%ESP + 20]
cmp %EAX, %ECX
fxch %ST(1)
fcmovae %ST(0), %ST(1)
*** fxch %ST(1)
*** fstp %ST(0)
ret
In practice, this only effects code size: performance should be basically
unaffected.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12588 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/DemoteRegToStack.cpp')
0 files changed, 0 insertions, 0 deletions