derek.holloway
7502bf64a4
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32 lines
1.1 KiB
LLVM
32 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -mtriple=nvptx64 -verify-machineinstrs < %s | FileCheck %s
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; RUN: %if ptxas %{ llc -mtriple=nvptx64 -verify-machineinstrs < %s | %ptxas-verify %}
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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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define i32 @pow2_mask_cmp(i32 %x) {
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; CHECK-LABEL: pow2_mask_cmp(
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; CHECK: {
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; CHECK-NEXT: .reg .b16 %rs<3>;
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; CHECK-NEXT: .reg .b32 %r<3>;
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; CHECK-EMPTY:
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; CHECK-NEXT: // %bb.0:
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; CHECK-NEXT: ld.param.b8 %rs1, [pow2_mask_cmp_param_0];
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; CHECK-NEXT: shr.u16 %rs2, %rs1, 3;
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; CHECK-NEXT: cvt.u32.u16 %r1, %rs2;
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; CHECK-NEXT: and.b32 %r2, %r1, 1;
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; CHECK-NEXT: st.param.b32 [func_retval0], %r2;
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; CHECK-NEXT: ret;
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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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