20 lines
644 B
LLVM
20 lines
644 B
LLVM
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; RUN: llc -march=nvptx -verify-machineinstrs < %s | FileCheck %s
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; Tests the following pattern:
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; (X & 8) != 0 --> (X & 8) >> 3
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; This produces incorrect code in general when boolean false is
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; represented as a negative one. There is however a special
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; case when the type has a bitsize of 1, for which the false
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; value will be identical regardless of the boolean representation.
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; Check that the optimization triggers in this case.
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; CHECK-LABEL: @pow2_mask_cmp
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; CHECK: bfe.u32 {{%r[0-9]+}}, {{%r[0-9]+}}, 3, 1
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define i32 @pow2_mask_cmp(i32 %x) {
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%a = and i32 %x, 8
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%cmp = icmp ne i32 %a, 0
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%r = zext i1 %cmp to i32
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ret i32 %r
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}
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