diff options
Diffstat (limited to 'test/Transforms/InstCombine/overflow-mul.ll')
| -rw-r--r-- | test/Transforms/InstCombine/overflow-mul.ll | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/test/Transforms/InstCombine/overflow-mul.ll b/test/Transforms/InstCombine/overflow-mul.ll index 6d8d40b..bc0504b 100644 --- a/test/Transforms/InstCombine/overflow-mul.ll +++ b/test/Transforms/InstCombine/overflow-mul.ll @@ -174,6 +174,17 @@ define <4 x i32> @pr20113(<4 x i16> %a, <4 x i16> %b) { ret <4 x i32> %vcgez.i } + +; The last test needs this weird datalayout. +target datalayout = "i32:8:8" +; Without it, InstCombine will align the pointed on 4 Bytes +; The KnownBitsZero that result from the alignment allows to +; turn: +; and i32 %mul, 255 +; to: +; and i32 %mul, 252 +; The mask is no longer in the form 2^n-1 and this prevents the transformation. + @pr21445_data = external global i32 define i1 @pr21445(i8 %a) { ; CHECK-LABEL: @pr21445( |