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broadcom/vc5: Stop lowering negates to subs.

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In the case of fneg(0.0), we were getting back 0.0 instead of -0.0.  We
were also needing an immediate 0 value for ineg, when there's an opcode to
do the job properly.

Fixes fs-floatBitsToInt-neg.shader_test.
This commit is contained in:
Eric Anholt 2017-10-26 15:40:38 -07:00
parent a797f0eb63
commit 4d2619a6b3
1 changed files with 8 additions and 1 deletions
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9
src/broadcom/compiler/nir_to_vir.c
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@ -806,6 +806,14 @@ ntq_emit_alu(struct v3d_compile *c, nir_alu_instr *instr)
case nir_op_imov:
result = vir_MOV(c, src[0]);
break;
case nir_op_fneg:
result = vir_XOR(c, src[0], vir_uniform_ui(c, 1 << 31));
break;
case nir_op_ineg:
result = vir_NEG(c, src[0]);
break;
case nir_op_fmul:
result = vir_FMUL(c, src[0], src[1]);
break;
@ -1984,7 +1992,6 @@ const nir_shader_compiler_options v3d_nir_options = {
.lower_fpow = true,
.lower_fsat = true,
.lower_fsqrt = true,
.lower_negate = true,
.native_integers = true,
};