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https://github.com/c64scene-ar/llvm-6502.git
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de2e0bc366
V_ADD_F32 with source modifier does not produce -0.0 for this. Just manipulate the sign bit directly instead. Also add a pattern for (fneg (fabs ...)). Fixes a bunch of bit encoding piglit tests with radeonsi. Reviewed-by: Tom Stellard <thomas.stellard@amd.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200743 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.8 KiB
LLVM
62 lines
1.8 KiB
LLVM
; RUN: llc < %s -march=r600 -mcpu=redwood | FileCheck %s --check-prefix=R600-CHECK
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; RUN: llc < %s -march=r600 -mcpu=SI -verify-machineinstrs | FileCheck %s --check-prefix=SI-CHECK
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; R600-CHECK-LABEL: @fneg
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; R600-CHECK: -PV
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; SI-CHECK-LABEL: @fneg
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; SI-CHECK: V_XOR_B32
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define void @fneg(float addrspace(1)* %out, float %in) {
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entry:
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%0 = fsub float -0.000000e+00, %in
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store float %0, float addrspace(1)* %out
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ret void
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}
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; R600-CHECK-LABEL: @fneg_v2
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; R600-CHECK: -PV
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; R600-CHECK: -PV
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; SI-CHECK-LABEL: @fneg_v2
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; SI-CHECK: V_XOR_B32
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; SI-CHECK: V_XOR_B32
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define void @fneg_v2(<2 x float> addrspace(1)* nocapture %out, <2 x float> %in) {
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entry:
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%0 = fsub <2 x float> <float -0.000000e+00, float -0.000000e+00>, %in
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store <2 x float> %0, <2 x float> addrspace(1)* %out
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ret void
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}
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; R600-CHECK-LABEL: @fneg_v4
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; R600-CHECK: -PV
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; R600-CHECK: -T
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; R600-CHECK: -PV
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; R600-CHECK: -PV
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; SI-CHECK-LABEL: @fneg_v4
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; SI-CHECK: V_XOR_B32
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; SI-CHECK: V_XOR_B32
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; SI-CHECK: V_XOR_B32
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; SI-CHECK: V_XOR_B32
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define void @fneg_v4(<4 x float> addrspace(1)* nocapture %out, <4 x float> %in) {
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entry:
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%0 = fsub <4 x float> <float -0.000000e+00, float -0.000000e+00, float -0.000000e+00, float -0.000000e+00>, %in
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store <4 x float> %0, <4 x float> addrspace(1)* %out
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ret void
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}
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; DAGCombiner will transform:
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; (fneg (f32 bitcast (i32 a))) => (f32 bitcast (xor (i32 a), 0x80000000))
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; unless the target returns true for isNegFree()
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; R600-CHECK-LABEL: @fneg_free
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; R600-CHECK-NOT: XOR
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; R600-CHECK: -KC0[2].Z
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; SI-CHECK-LABEL: @fneg_free
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; XXX: We could use V_ADD_F32_e64 with the negate bit here instead.
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; SI-CHECK: V_SUB_F32_e64 v{{[0-9]}}, 0.000000e+00, s{{[0-9]}}, 0, 0, 0, 0
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define void @fneg_free(float addrspace(1)* %out, i32 %in) {
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entry:
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%0 = bitcast i32 %in to float
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%1 = fsub float 0.0, %0
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store float %1, float addrspace(1)* %out
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ret void
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}
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