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Add PPC64 mulli pattern

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The PPC backend had been missing a pattern to generate mulli for 64-bit
multiples. We had been generating it only for 32-bit multiplies. Unfortunately,
generating li + mulld unnecessarily increases register pressure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187807 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel
2013-08-06 17:03:03 +00:00
parent 62d6fa5e8f
commit 0e910d2cb5
2 changed files with 19 additions and 0 deletions
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test/CodeGen/PowerPC/mulli64.ll
+16
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; RUN: llc -mcpu=pwr7 -mtriple=powerpc64-unknown-linux-gnu < %s | FileCheck %s
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define i64 @foo(i64 %a) #0 {
entry:
%mul = mul nsw i64 %a, 3
ret i64 %mul
}
; CHECK-LABEL: @foo
; CHECK: mulli 3, 3, 3
; CHECK: blr
attributes #0 = { nounwind readnone }