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author | Tim Northover <tnorthover@apple.com> | 2014-07-23 13:59:12 +0000 |
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committer | Tim Northover <tnorthover@apple.com> | 2014-07-23 13:59:12 +0000 |
commit | afb1938c3955a45d90e681a0e51a8055a0f9bcf3 (patch) | |
tree | b0be507dabd27532b92c745528bae4f078626cd2 /test/CodeGen/ARM/sbfx.ll | |
parent | 52aa80b06852f30356fb939b1fe59f201f5dcdd6 (diff) |
ARM: spot SBFX-compatbile code expressed with sign_extend_inreg
We were assuming all SBFX-like operations would have the shl/asr form, but
often when the field being extracted is an i8 or i16, we end up with a
SIGN_EXTEND_INREG acting on a shift instead. Simple enough to check for though.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213754 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/CodeGen/ARM/sbfx.ll')
-rw-r--r-- | test/CodeGen/ARM/sbfx.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test/CodeGen/ARM/sbfx.ll b/test/CodeGen/ARM/sbfx.ll index 3c25edcaa75..5b77c59bca9 100644 --- a/test/CodeGen/ARM/sbfx.ll +++ b/test/CodeGen/ARM/sbfx.ll @@ -45,3 +45,21 @@ entry: %tmp2 = ashr i32 %tmp, 1 ret i32 %tmp2 } + +define signext i8 @f6(i32 %a) { +; CHECK-LABEL: f6: +; CHECK: sbfx r0, r0, #23, #8 + + %tmp = lshr i32 %a, 23 + %res = trunc i32 %tmp to i8 + ret i8 %res +} + +define signext i8 @f7(i32 %a) { +; CHECK-LABEL: f7: +; CHECK-NOT: sbfx + + %tmp = lshr i32 %a, 25 + %res = trunc i32 %tmp to i8 + ret i8 %res +} |