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adding another optimization opportunity to readme file

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263775 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ehsan Amiri 2016-03-18 04:02:25 +00:00
parent 3175d6f980
commit ffbba125c0
1 changed files with 11 additions and 0 deletions
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11
lib/Target/PowerPC/README.txt
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@ -589,6 +589,17 @@ entry:
%tmp34 = zext i1 %tmp3 to i32 ; <i32> [#uses=1]
ret i32 %tmp34
}
//===---------------------------------------------------------------------===//
for the following code:
void foo (float *__restrict__ a, int *__restrict__ b, int n) {
a[n] = b[n] * 2.321;
}
we load b[n] to GPR, then move it VSX register and convert it float. We should
use vsx scalar integer load instructions to avoid direct moves
//===----------------------------------------------------------------------===//
; RUN: llvm-as < %s | llc -march=ppc32 | not grep fneg