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radv: flush f32->f16 conversion denormals to zero. (v2)

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SPIR-V defines the f32->f16 operation as flushing denormals to 0,
this compares the class using amd class opcode.

Thanks to Matt Arsenault for figuring it out.

This fix is VI+ only, add a TODO for SI/CIK.

This fixes:
dEQP-VK.spirv_assembly.instruction.compute.opquantize.flush_to_zero

Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2017-03-17 12:11:30 +10:00
parent eeff7e1154
commit 83e58b036e
2 changed files with 41 additions and 4 deletions
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32
src/amd/common/ac_nir_to_llvm.c
View file

@ -1325,6 +1325,33 @@ static LLVMValueRef emit_b2f(struct nir_to_llvm_context *ctx,
return LLVMBuildAnd(ctx->builder, src0, LLVMBuildBitCast(ctx->builder, LLVMConstReal(ctx->f32, 1.0), ctx->i32, ""), "");
}
static LLVMValueRef emit_f2f16(struct nir_to_llvm_context *ctx,
LLVMValueRef src0)
{
LLVMValueRef result;
LLVMValueRef cond;
src0 = to_float(ctx, src0);
result = LLVMBuildFPTrunc(ctx->builder, src0, ctx->f16, "");
/* TODO SI/CIK options here */
if (ctx->options->chip_class >= VI) {
LLVMValueRef args[2];
/* Check if the result is a denormal - and flush to 0 if so. */
args[0] = result;
args[1] = LLVMConstInt(ctx->i32, N_SUBNORMAL | P_SUBNORMAL, false);
cond = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.class.f16", ctx->i1, args, 2, AC_FUNC_ATTR_READNONE);
}
/* need to convert back up to f32 */
result = LLVMBuildFPExt(ctx->builder, result, ctx->f32, "");
if (ctx->options->chip_class >= VI)
result = LLVMBuildSelect(ctx->builder, cond, ctx->f32zero, result, "");
return result;
}
static LLVMValueRef emit_umul_high(struct nir_to_llvm_context *ctx,
LLVMValueRef src0, LLVMValueRef src1)
{
@ -1812,10 +1839,7 @@ static void visit_alu(struct nir_to_llvm_context *ctx, nir_alu_instr *instr)
result = emit_b2f(ctx, src[0]);
break;
case nir_op_fquantize2f16:
src[0] = to_float(ctx, src[0]);
result = LLVMBuildFPTrunc(ctx->builder, src[0], ctx->f16, "");
/* need to convert back up to f32 */
result = LLVMBuildFPExt(ctx->builder, result, ctx->f32, "");
result = emit_f2f16(ctx, src[0]);
break;
case nir_op_umul_high:
result = emit_umul_high(ctx, src[0], src[1]);

13
src/amd/common/sid.h
View file

@ -9095,5 +9095,18 @@
#define CIK_SDMA_PACKET_SRBM_WRITE 0xe
#define CIK_SDMA_COPY_MAX_SIZE 0x3fffe0
enum amd_cmp_class_flags {
S_NAN = 1 << 0, // Signaling NaN
Q_NAN = 1 << 1, // Quiet NaN
N_INFINITY = 1 << 2, // Negative infinity
N_NORMAL = 1 << 3, // Negative normal
N_SUBNORMAL = 1 << 4, // Negative subnormal
N_ZERO = 1 << 5, // Negative zero
P_ZERO = 1 << 6, // Positive zero
P_SUBNORMAL = 1 << 7, // Positive subnormal
P_NORMAL = 1 << 8, // Positive normal
P_INFINITY = 1 << 9 // Positive infinity
};
#endif /* _SID_H */