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a8edcf036b
We were relying on constant folding of the legalized instructions to do what constant folding we had previously llvm-svn: 292114
33 lines
613 B
LLVM
33 lines
613 B
LLVM
; RUN: llc -mtriple=armv8-eabi %s -o - | FileCheck %s
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; CHECK-LABEL: rbit
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; CHECK: rbit r0, r0
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define i32 @rbit(i32 %t) {
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entry:
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%rbit = call i32 @llvm.arm.rbit(i32 %t)
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ret i32 %rbit
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}
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; CHECK-LABEL: rbit_constant
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; CHECK: mov r0, #0
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; CHECK-NOT: rbit
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; CHECK: bx lr
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define i32 @rbit_constant() {
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entry:
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%rbit.i = call i32 @llvm.arm.rbit(i32 0)
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ret i32 %rbit.i
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}
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declare i32 @llvm.arm.rbit(i32)
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declare i32 @llvm.bitreverse.i32(i32) readnone
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; CHECK-LABEL: rbit_generic
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; CHECK: rbit r0, r0
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define i32 @rbit_generic(i32 %t) {
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entry:
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%rbit = call i32 @llvm.bitreverse.i32(i32 %t)
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ret i32 %rbit
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}
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