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Fix ARM isle code that optimize multiply by constants which are power-of-2 +/- 1.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76520 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2009-07-21 00:31:12 +00:00
parent c95be59371
commit af9e7a7c20
3 changed files with 61 additions and 16 deletions
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18
test/CodeGen/Thumb2/mul_const.ll Normal file
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@@ -0,0 +1,18 @@
; RUN: llvm-as < %s | llc -march=thumb -mattr=+thumb2 | FileCheck %s
; rdar://7069502
define i32 @t1(i32 %v) nounwind readnone {
entry:
; CHECK: t1:
; CHECK: add r0, r0, r0, lsl #3
%0 = mul i32 %v, 9
ret i32 %0
}
define i32 @t2(i32 %v) nounwind readnone {
entry:
; CHECK: t2:
; CHECK: rsb r0, r0, r0, lsl #3
%0 = mul i32 %v, 7
ret i32 %0
}