debian/changelog | 1
debian/patches/fix-altivec-intrinsics.patch | 111 ++++++++++++++++++++++++++++
debian/patches/series | 1
3 files changed, 113 insertions(+)
New commits:
commit 3d2d673b8719363a982a30185d1083c97000f6f9
Author: Maarten Lankhorst <d...@mblankhorst.nl>
Date: Thu Sep 18 08:32:58 2014 +0200
Import upstream fix for altivec little endian instructions.
diff --git a/debian/changelog b/debian/changelog
index 09fb41a..676e8a3 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,6 +1,7 @@
mesa (10.3.0~rc3-2ubuntu1) UNRELEASED; urgency=low
* Merge from released debian-experimental.
+ * Import upstream fix for altivec little endian instructions.
-- Maarten Lankhorst <maarten.lankho...@ubuntu.com> Tue, 12 Aug 2014
09:38:49 +0200
diff --git a/debian/patches/fix-altivec-intrinsics.patch
b/debian/patches/fix-altivec-intrinsics.patch
new file mode 100644
index 0000000..c67784a
--- /dev/null
+++ b/debian/patches/fix-altivec-intrinsics.patch
@@ -0,0 +1,111 @@
+commit 0feb977bbfb0d6bb2c8d3178246acb035a739f37
+Author: Ulrich Weigand <uweig...@de.ibm.com>
+Date: Mon Aug 4 18:41:00 2014 +0200
+
+ gallivm: Fix Altivec pack intrinsics for little-endian
+
+ This patch fixes use of Altivec pack intrinsics on little-endian PowerPC
+ systems. Since little-endian operation only affects the load and store
+ instructions, the semantics of pack (and other) instructions that take
+ two input vectors implicitly change: the pack instructions still fill
+ a register placing values from the first operand into the "high" parts
+ of the register, and values from the second operand into the "low" parts
+ of the register, but since vector loads and stores perform an endian swap,
+ the high parts end up at high memory addresses.
+
+ To still achieve the desired effect, we have to swap the two inputs to
+ the pack instruction on little-endian systems. This is done automatically
+ by the back-end for instructions generated by LLVM, but needs to be done
+ manually when emitting intrisincs (which still result in that instruction
+ being emitted directly).
+
+ Signed-off-by: Ulrich Weigand <ulrich.weig...@de.ibm.com>
+ Signed-off-by: Maarten Lankhorst <d...@mblankhorst.nl>
+
+diff --git a/src/gallium/auxiliary/gallivm/lp_bld_pack.c
b/src/gallium/auxiliary/gallivm/lp_bld_pack.c
+index a48a922..cdf6d80 100644
+--- a/src/gallium/auxiliary/gallivm/lp_bld_pack.c
++++ b/src/gallium/auxiliary/gallivm/lp_bld_pack.c
+@@ -464,6 +464,7 @@ lp_build_pack2(struct gallivm_state *gallivm,
+ 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:
+@@ -482,6 +483,9 @@ lp_build_pack2(struct gallivm_state *gallivm,
+ } else {
+ intrinsic = "llvm.ppc.altivec.vpkuwus";
+ }
++#ifdef PIPE_ARCH_LITTLE_ENDIAN
++ swap_intrinsic_operands = TRUE;
++#endif
+ }
+ break;
+ case 16:
+@@ -490,12 +494,18 @@ lp_build_pack2(struct gallivm_state *gallivm,
+ intrinsic = "llvm.x86.sse2.packsswb.128";
+ } else if (util_cpu_caps.has_altivec) {
+ intrinsic = "llvm.ppc.altivec.vpkshss";
++#ifdef PIPE_ARCH_LITTLE_ENDIAN
++ swap_intrinsic_operands = TRUE;
++#endif
+ }
+ } else {
+ if (util_cpu_caps.has_sse2) {
+ intrinsic = "llvm.x86.sse2.packuswb.128";
+ } else if (util_cpu_caps.has_altivec) {
+ intrinsic = "llvm.ppc.altivec.vpkshus";
++#ifdef PIPE_ARCH_LITTLE_ENDIAN
++ swap_intrinsic_operands = TRUE;
++#endif
+ }
+ }
+ break;
+@@ -504,7 +514,11 @@ lp_build_pack2(struct gallivm_state *gallivm,
+ if (intrinsic) {
+ if (src_type.width * src_type.length == 128) {
+ LLVMTypeRef intr_vec_type = lp_build_vec_type(gallivm, intr_type);
+- res = lp_build_intrinsic_binary(builder, intrinsic,
intr_vec_type, lo, hi);
++ if (swap_intrinsic_operands) {
++ res = lp_build_intrinsic_binary(builder, intrinsic,
intr_vec_type, hi, lo);
++ } else {
++ res = lp_build_intrinsic_binary(builder, intrinsic,
intr_vec_type, lo, hi);
++ }
+ if (dst_vec_type != intr_vec_type) {
+ res = LLVMBuildBitCast(builder, res, dst_vec_type, "");
+ }
+@@ -513,6 +527,8 @@ lp_build_pack2(struct gallivm_state *gallivm,
+ int num_split = src_type.width * src_type.length / 128;
+ int i;
+ int nlen = 128 / src_type.width;
++ int lo_off = swap_intrinsic_operands ? nlen : 0;
++ int hi_off = swap_intrinsic_operands ? 0 : nlen;
+ struct lp_type ndst_type = lp_type_unorm(dst_type.width, 128);
+ struct lp_type nintr_type = lp_type_unorm(intr_type.width, 128);
+ LLVMValueRef tmpres[LP_MAX_VECTOR_WIDTH / 128];
+@@ -524,9 +540,9 @@ lp_build_pack2(struct gallivm_state *gallivm,
+
+ for (i = 0; i < num_split / 2; i++) {
+ tmplo = lp_build_extract_range(gallivm,
+- lo, i*nlen*2, nlen);
++ lo, i*nlen*2 + lo_off, nlen);
+ tmphi = lp_build_extract_range(gallivm,
+- lo, i*nlen*2 + nlen, nlen);
++ lo, i*nlen*2 + hi_off, nlen);
+ tmpres[i] = lp_build_intrinsic_binary(builder, intrinsic,
+ nintr_vec_type, tmplo,
tmphi);
+ if (ndst_vec_type != nintr_vec_type) {
+@@ -535,9 +551,9 @@ lp_build_pack2(struct gallivm_state *gallivm,
+ }
+ for (i = 0; i < num_split / 2; i++) {
+ tmplo = lp_build_extract_range(gallivm,
+- hi, i*nlen*2, nlen);
++ hi, i*nlen*2 + lo_off, nlen);
+ tmphi = lp_build_extract_range(gallivm,
+- hi, i*nlen*2 + nlen, nlen);
++ hi, i*nlen*2 + hi_off, nlen);
+ tmpres[i+num_split/2] = lp_build_intrinsic_binary(builder,
intrinsic,
+
nintr_vec_type,
+ tmplo,
tmphi);
diff --git a/debian/patches/series b/debian/patches/series
index 8a081b6..236f10d 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -4,3 +4,4 @@
# Ubuntu patches.
egl-platform-mir.patch
i915-dont-default-to-2.1.patch
+fix-altivec-intrinsics.patch
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