a284bdb311
This moves the combine of fdiv by constant to fmul out of an 'if (Options.UnsafeFPMath || Flags.hasAllowReciprocal()' block, so that it triggers if the divide is exact. An extra check for Recip.isDenormal() is added as multiple places make reference to it being unsafe or slow on certain platforms.
53 lines
1.9 KiB
LLVM
53 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=amdgcn -mcpu=gfx1010 -verify-machineinstrs -o - %s | FileCheck --check-prefix=GCN %s
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;
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; This test shows a typical case that a PHI(%c2) in join block was treated as uniform
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; as it has one unique uniform incoming value plus one additional undef incoming
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; value. This case might suffer from correctness issue if %c2 was assigned a scalar
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; register but meanwhile dead in %if. The problem is solved by replacing the %undef
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; with %c (thus replacing %c2 with %c in this example).
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define amdgpu_ps float @uniform_phi_with_undef(float inreg %c, float %v, i32 %x, i32 %y) #0 {
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; GCN-LABEL: uniform_phi_with_undef:
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; GCN: ; %bb.0: ; %entry
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; GCN-NEXT: v_cmp_lt_i32_e64 s2, v2, v1
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; GCN-NEXT: s_mov_b32 s1, exec_lo
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; GCN-NEXT: s_and_b32 s2, s1, s2
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; GCN-NEXT: s_mov_b32 exec_lo, s2
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; GCN-NEXT: s_cbranch_execz .LBB0_2
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; GCN-NEXT: ; %bb.1: ; %if
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; GCN-NEXT: s_mov_b32 s2, 0x40400000
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; GCN-NEXT: v_div_scale_f32 v1, s3, s2, s2, v0
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; GCN-NEXT: v_rcp_f32_e64 v2, v1
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; GCN-NEXT: s_mov_b32 s3, 1.0
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; GCN-NEXT: v_fma_f32 v3, -v1, v2, s3
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; GCN-NEXT: v_fmac_f32_e64 v2, v3, v2
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; GCN-NEXT: v_div_scale_f32 v3, vcc_lo, v0, s2, v0
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; GCN-NEXT: v_mul_f32_e64 v4, v3, v2
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; GCN-NEXT: v_fma_f32 v5, -v1, v4, v3
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; GCN-NEXT: v_fmac_f32_e64 v4, v5, v2
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; GCN-NEXT: v_fma_f32 v1, -v1, v4, v3
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; GCN-NEXT: v_div_fmas_f32 v1, v1, v2, v4
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; GCN-NEXT: v_div_fixup_f32 v0, v1, s2, v0
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; GCN-NEXT: .LBB0_2: ; %end
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; GCN-NEXT: s_or_b32 exec_lo, exec_lo, s1
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; GCN-NEXT: v_add_f32_e64 v0, v0, s0
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; GCN-NEXT: ; return to shader part epilog
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entry:
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%cc = icmp slt i32 %y, %x
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br i1 %cc, label %if, label %end
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if:
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%v.if = fdiv float %v, 3.0
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br label %end
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end:
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%v2 = phi float [ %v.if, %if ], [ %v, %entry ]
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%c2 = phi float [ undef, %if ], [ %c, %entry ]
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%r = fadd float %v2, %c2
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ret float %r
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}
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attributes #0 = { nounwind optnone noinline }
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