| ; RUN: llc < %s -march=x86 | FileCheck %s |
| |
| ; When doing sign extension, use the sext-load lowering to take advantage of |
| ; x86's sign extension during loads. |
| ; |
| ; CHECK-LABEL: test1: |
| ; CHECK: movsbl {{.*}}, %eax |
| ; CHECK-NEXT: ret |
| define i32 @test1(i32 %X) nounwind { |
| entry: |
| %tmp12 = trunc i32 %X to i8 ; <i8> [#uses=1] |
| %tmp123 = sext i8 %tmp12 to i32 ; <i32> [#uses=1] |
| ret i32 %tmp123 |
| } |
| |
| ; When using a sextload representation, ensure that the sign extension is |
| ; preserved even when removing shifted-out low bits. |
| ; |
| ; CHECK-LABEL: test2: |
| ; CHECK: movswl {{.*}}, %eax |
| ; CHECK-NEXT: ret |
| define i32 @test2({i16, [6 x i8]}* %this) { |
| entry: |
| %b48 = getelementptr inbounds { i16, [6 x i8] }, { i16, [6 x i8] }* %this, i32 0, i32 1 |
| %cast = bitcast [6 x i8]* %b48 to i48* |
| %bf.load = load i48, i48* %cast, align 2 |
| %bf.ashr = ashr i48 %bf.load, 32 |
| %bf.cast = trunc i48 %bf.ashr to i32 |
| ret i32 %bf.cast |
| } |