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| author | Nemanja Ivanovic <nemanja.i.ibm@gmail.com> | 2018-03-05 19:27:16 +0000 |
|---|---|---|
| committer | Nemanja Ivanovic <nemanja.i.ibm@gmail.com> | 2018-03-05 19:27:16 +0000 |
| commit | 6cc31ca81446b3fc61e02e2c231436978746decd (patch) | |
| tree | 0b0f5df8546c7ed7475b83d4b1e28ade79af0cb5 /llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll | |
| parent | 77ae82b84a451f1a3af878da1a4efb5fb0a043b6 (diff) | |
| download | bcm5719-llvm-6cc31ca81446b3fc61e02e2c231436978746decd.tar.gz bcm5719-llvm-6cc31ca81446b3fc61e02e2c231436978746decd.zip | |
[PowerPC] Do not emit record-form rotates when record-form andi suffices
Up until Power9, the performance profile for rlwinm., rldicl. and andi. looked
more or less equivalent. However with Power9, the rotates are still 2-way
cracked whereas the and-immediate is not.
This patch just ensures that we don't emit record-form rotates when an andi.
is adequate.
As first pointed out by Carrot in https://bugs.llvm.org/show_bug.cgi?id=30833
(this patch is a fix for that PR).
Differential Revision: https://reviews.llvm.org/D43977
llvm-svn: 326736
Diffstat (limited to 'llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll')
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll b/llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll index 282a31b1e27..ccc76e232b6 100644 --- a/llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll +++ b/llvm/test/CodeGen/PowerPC/rlwinm-zero-ext.ll @@ -6,7 +6,7 @@ target triple = "powerpc64le-unknown-linux-gnu" define i8 @test1(i32 %a) { entry: ; CHECK-NOT: rlwinm {{{[0-9]+}}}, {{[0-9]+}}, 0, 24, 27 -; CHECK: rlwinm. [[REG:[0-9]+]], {{[0-9]+}}, 0, 24, 27 +; CHECK: andi. [[REG:[0-9]+]], {{[0-9]+}}, 240 ; CHECK-NOT: cmplwi [[REG]], 0 ; CHECK: beq 0 %0 = and i32 %a, 240 |
