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llvmpipe: use vpkswss when dst is signed

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This patch fixes a bug when building a pack instruction.

For POWER (altivec), in case the destination is signed and the
src width is 32, we need to use vpkswss. The original code used vpkuwus,
which emits an unsigned result.

This fixes the following piglit tests on ppc64le:
- spec@arb_color_buffer_float@gl_rgba8-drawpixels
- shaders@glsl-fs-fogscale

I've also corrected some coding style issues in the function.

v2: Returned else statements to vmware style

Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
(cherry picked from commit 679a654a77)
This commit is contained in:
Oded Gabbay 2016-01-17 22:15:40 +02:00 • committed by Emil Velikov
parent d98506e2f8
commit 2fa0daba95
1 changed files with 15 additions and 16 deletions
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31
src/gallium/auxiliary/gallivm/lp_bld_pack.c
View file

@ -461,50 +461,49 @@ lp_build_pack2(struct gallivm_state *gallivm,
assert(src_type.length * 2 == dst_type.length);
/* Check for special cases first */
if((util_cpu_caps.has_sse2 || util_cpu_caps.has_altivec) &&
src_type.width * src_type.length >= 128) {
if ((util_cpu_caps.has_sse2 || util_cpu_caps.has_altivec) &&
src_type.width * src_type.length >= 128) {
const char *intrinsic = NULL;
boolean swap_intrinsic_operands = FALSE;
switch(src_type.width) {
case 32:
if (util_cpu_caps.has_sse2) {
if(dst_type.sign) {
if (dst_type.sign) {
intrinsic = "llvm.x86.sse2.packssdw.128";
}
else {
} else {
if (util_cpu_caps.has_sse4_1) {
intrinsic = "llvm.x86.sse41.packusdw";
}
}
} else if (util_cpu_caps.has_altivec) {
if (dst_type.sign) {
intrinsic = "llvm.ppc.altivec.vpkswus";
} else {
intrinsic = "llvm.ppc.altivec.vpkuwus";
}
intrinsic = "llvm.ppc.altivec.vpkswss";
} else {
intrinsic = "llvm.ppc.altivec.vpkuwus";
}
#ifdef PIPE_ARCH_LITTLE_ENDIAN
swap_intrinsic_operands = TRUE;
swap_intrinsic_operands = TRUE;
#endif
}
break;
case 16:
if (dst_type.sign) {
if (util_cpu_caps.has_sse2) {
intrinsic = "llvm.x86.sse2.packsswb.128";
intrinsic = "llvm.x86.sse2.packsswb.128";
} else if (util_cpu_caps.has_altivec) {
intrinsic = "llvm.ppc.altivec.vpkshss";
intrinsic = "llvm.ppc.altivec.vpkshss";
#ifdef PIPE_ARCH_LITTLE_ENDIAN
swap_intrinsic_operands = TRUE;
swap_intrinsic_operands = TRUE;
#endif
}
} else {
if (util_cpu_caps.has_sse2) {
intrinsic = "llvm.x86.sse2.packuswb.128";
intrinsic = "llvm.x86.sse2.packuswb.128";
} else if (util_cpu_caps.has_altivec) {
intrinsic = "llvm.ppc.altivec.vpkshus";
intrinsic = "llvm.ppc.altivec.vpkshus";
#ifdef PIPE_ARCH_LITTLE_ENDIAN
swap_intrinsic_operands = TRUE;
swap_intrinsic_operands = TRUE;
#endif
}
}