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42 lines
974 B
LLVM
42 lines
974 B
LLVM
; RUN: llc < %s -mcpu=generic -march=x86 | FileCheck %s
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;; Simple case
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define i32 @test1(i8 %x) nounwind readnone {
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%A = and i8 %x, -32
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%B = zext i8 %A to i32
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ret i32 %B
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}
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; CHECK: test1
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; CHECK: movzbl
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; CHECK-NEXT: andl {{.*}}224
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;; Multiple uses of %x but easily extensible.
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define i32 @test2(i8 %x) nounwind readnone {
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%A = and i8 %x, -32
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%B = zext i8 %A to i32
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%C = or i8 %x, 63
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%D = zext i8 %C to i32
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%E = add i32 %B, %D
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ret i32 %E
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}
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; CHECK: test2
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; CHECK: movzbl
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; CHECK: orl $63
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; CHECK: andl $224
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declare void @use(i32, i8)
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;; Multiple uses of %x where we shouldn't extend the load.
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define void @test3(i8 %x) nounwind readnone {
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%A = and i8 %x, -32
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%B = zext i8 %A to i32
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call void @use(i32 %B, i8 %x)
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ret void
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}
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; CHECK: test3
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; CHECK: movzbl {{[0-9]+}}(%esp), [[REGISTER:%e[a-z]{2}]]
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; CHECK-NEXT: movl [[REGISTER]], 4(%esp)
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; CHECK-NEXT: andl $224, [[REGISTER]]
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; CHECK-NEXT: movl [[REGISTER]], (%esp)
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; CHECK-NEXT: call{{.*}}use
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