fa98fcd02e
It's possible to determine the sign bit if the value is known one of the positive/negative classes and not-nan.
47 lines
1.6 KiB
LLVM
47 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 < %s | FileCheck %s
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define i32 @known_positive(float nofpclass(nan ninf nzero nsub nnorm) %signbit.zero) #0 {
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; CHECK-LABEL: known_positive:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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%cast = bitcast float %signbit.zero to i32
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%and = and i32 %cast, 2147483647
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ret i32 %and
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}
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define i32 @known_positive_maybe_nan(float nofpclass(ninf nzero nsub nnorm) %signbit.zero) #0 {
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; CHECK-LABEL: known_positive_maybe_nan:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: v_and_b32_e32 v0, 0x7fffffff, v0
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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%cast = bitcast float %signbit.zero to i32
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%and = and i32 %cast, 2147483647
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ret i32 %and
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}
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define i32 @known_negative(float nofpclass(nan pinf pzero psub pnorm) %signbit.one) #0 {
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; CHECK-LABEL: known_negative:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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%cast = bitcast float %signbit.one to i32
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%or = or i32 %cast, -2147483648
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ret i32 %or
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}
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define i32 @known_negative_maybe_nan(float nofpclass(pinf pzero psub pnorm) %signbit.one) #0 {
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; CHECK-LABEL: known_negative_maybe_nan:
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; CHECK: ; %bb.0:
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; CHECK-NEXT: s_waitcnt vmcnt(0) expcnt(0) lgkmcnt(0)
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; CHECK-NEXT: v_or_b32_e32 v0, 0x80000000, v0
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; CHECK-NEXT: s_setpc_b64 s[30:31]
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%cast = bitcast float %signbit.one to i32
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%or = or i32 %cast, -2147483648
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ret i32 %or
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}
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attributes #0 = { nounwind }
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