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| author | Chris Lattner <sabre@nondot.org> | 2008-03-09 05:42:06 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-03-09 05:42:06 +0000 |
| commit | 67f453aae7ac55f30af9e961a21029beabaaf47b (patch) | |
| tree | 7a7fd9ea19992b97cc52890188a1cdab8940c738 /lib/Transforms/Utils/SimplifyCFG.cpp | |
| parent | 529de8a45702cd34968d79d13f95ed1e5d5fa250 (diff) | |
Finish implementing a readme entry: when inserting an i64 variable
into a vector of zeros or undef, and when the top part is obviously
zero, we can just use movd + shuffle. This allows us to compile
vec_set-B.ll into:
_test3:
movl $1234567, %eax
andl 4(%esp), %eax
movd %eax, %xmm0
ret
instead of:
_test3:
subl $28, %esp
movl $1234567, %eax
andl 32(%esp), %eax
movl %eax, (%esp)
movl $0, 4(%esp)
movq (%esp), %xmm0
addl $28, %esp
ret
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48090 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/SimplifyCFG.cpp')
0 files changed, 0 insertions, 0 deletions