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[Reassociate] Canonicalize negative constants out of expressions.

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This is a reapplication of r221171, but we only perform the transformation
on expressions which include a multiplication.  We do not transform rem/div
operations as this doesn't appear to be safe in all cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221721 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier
2014-11-11 22:58:35 +00:00
parent abb3335f6d
commit 2244d9a5d2
5 changed files with 202 additions and 112 deletions
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6
test/Transforms/Reassociate/wrap-flags.ll
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@@ -5,7 +5,7 @@
; CHECK-LABEL: @shl_to_mul_nsw(
; CHECK: %mul = mul i32 %i, -2147483648
; CHECK: %mul2 = add i32 %mul, 1
; CHECK: add i32 %mul, 1
define i32 @shl_to_mul_nsw(i32 %i) {
entry:
%mul = shl nsw i32 %i, 31
@@ -15,7 +15,7 @@ entry:
; CHECK-LABEL: @shl_to_mul_nuw(
; CHECK: %mul = mul nuw i32 %i, 4
; CHECK: %mul2 = add i32 %mul, 1
; CHECK: add i32 %mul, 1
define i32 @shl_to_mul_nuw(i32 %i) {
entry:
%mul = shl nuw i32 %i, 2
@@ -25,7 +25,7 @@ entry:
; CHECK-LABEL: @shl_to_mul_nuw_nsw(
; CHECK: %mul = mul nuw nsw i32 %i, 4
; CHECK: %mul2 = add i32 %mul, 1
; CHECK: add i32 %mul, 1
define i32 @shl_to_mul_nuw_nsw(i32 %i) {
entry:
%mul = shl nuw nsw i32 %i, 2