jsji created this revision. jsji added reviewers: nemanjai, hfinkel. Herald added subscribers: cfe-commits, shchenz, MaskRay, kbarton. Herald added a project: clang. jsji added a reviewer: PowerPC. Herald added a subscriber: wuzish.
This is similar to vec_ct* in https://reviews.llvm.org/rL304205. The argument must be a constant, otherwise instruction selection will fail. always_inline is not enough for isel to always fold everything away at -O0. The fix is to turn the function into macros in altivec.h. Fixes https://bugs.llvm.org/show_bug.cgi?id=43072 Repository: rG LLVM Github Monorepo https://reviews.llvm.org/D66699 Files: clang/include/clang/Basic/BuiltinsPPC.def clang/lib/Headers/altivec.h clang/test/CodeGen/altivec-dss.c clang/test/CodeGen/builtins-ppc-error.c Index: clang/test/CodeGen/builtins-ppc-error.c =================================================================== --- clang/test/CodeGen/builtins-ppc-error.c +++ clang/test/CodeGen/builtins-ppc-error.c @@ -73,3 +73,8 @@ __builtin_unpack_vector_int128(vsllli, index); //expected-error {{argument to '__builtin_unpack_vector_int128' must be a constant integer}} __builtin_unpack_vector_int128(vsllli, 5); //expected-error {{argument value 5 is outside the valid range [0, 1]}} } + +void testDSS(int index) { + vec_dss(index); //expected-error {{argument to '__builtin_altivec_dss' must be a constant integer}} + +} Index: clang/test/CodeGen/altivec-dss.c =================================================================== --- /dev/null +++ clang/test/CodeGen/altivec-dss.c @@ -0,0 +1,11 @@ +// RUN: %clang_cc1 -triple powerpc-linux-gnu -S -O0 -o - %s -target-feature +altivec | FileCheck %s + +// REQUIRES: powerpc-registered-target + +#include <altivec.h> + +// CHECK-LABEL: test1 +// CHECK: dss +void test1() { + vec_dss(1); +} Index: clang/lib/Headers/altivec.h =================================================================== --- clang/lib/Headers/altivec.h +++ clang/lib/Headers/altivec.h @@ -3286,9 +3286,7 @@ /* vec_dss */ -static __inline__ void __attribute__((__always_inline__)) vec_dss(int __a) { - __builtin_altivec_dss(__a); -} +#define vec_dss __builtin_altivec_dss /* vec_dssall */ Index: clang/include/clang/Basic/BuiltinsPPC.def =================================================================== --- clang/include/clang/Basic/BuiltinsPPC.def +++ clang/include/clang/Basic/BuiltinsPPC.def @@ -55,7 +55,7 @@ BUILTIN(__builtin_altivec_vctsxs, "V4SiV4fIi", "") BUILTIN(__builtin_altivec_vctuxs, "V4UiV4fIi", "") -BUILTIN(__builtin_altivec_dss, "vUi", "") +BUILTIN(__builtin_altivec_dss, "vUIi", "") BUILTIN(__builtin_altivec_dssall, "v", "") BUILTIN(__builtin_altivec_dst, "vvC*iUi", "") BUILTIN(__builtin_altivec_dstt, "vvC*iUi", "")
Index: clang/test/CodeGen/builtins-ppc-error.c =================================================================== --- clang/test/CodeGen/builtins-ppc-error.c +++ clang/test/CodeGen/builtins-ppc-error.c @@ -73,3 +73,8 @@ __builtin_unpack_vector_int128(vsllli, index); //expected-error {{argument to '__builtin_unpack_vector_int128' must be a constant integer}} __builtin_unpack_vector_int128(vsllli, 5); //expected-error {{argument value 5 is outside the valid range [0, 1]}} } + +void testDSS(int index) { + vec_dss(index); //expected-error {{argument to '__builtin_altivec_dss' must be a constant integer}} + +} Index: clang/test/CodeGen/altivec-dss.c =================================================================== --- /dev/null +++ clang/test/CodeGen/altivec-dss.c @@ -0,0 +1,11 @@ +// RUN: %clang_cc1 -triple powerpc-linux-gnu -S -O0 -o - %s -target-feature +altivec | FileCheck %s + +// REQUIRES: powerpc-registered-target + +#include <altivec.h> + +// CHECK-LABEL: test1 +// CHECK: dss +void test1() { + vec_dss(1); +} Index: clang/lib/Headers/altivec.h =================================================================== --- clang/lib/Headers/altivec.h +++ clang/lib/Headers/altivec.h @@ -3286,9 +3286,7 @@ /* vec_dss */ -static __inline__ void __attribute__((__always_inline__)) vec_dss(int __a) { - __builtin_altivec_dss(__a); -} +#define vec_dss __builtin_altivec_dss /* vec_dssall */ Index: clang/include/clang/Basic/BuiltinsPPC.def =================================================================== --- clang/include/clang/Basic/BuiltinsPPC.def +++ clang/include/clang/Basic/BuiltinsPPC.def @@ -55,7 +55,7 @@ BUILTIN(__builtin_altivec_vctsxs, "V4SiV4fIi", "") BUILTIN(__builtin_altivec_vctuxs, "V4UiV4fIi", "") -BUILTIN(__builtin_altivec_dss, "vUi", "") +BUILTIN(__builtin_altivec_dss, "vUIi", "") BUILTIN(__builtin_altivec_dssall, "v", "") BUILTIN(__builtin_altivec_dst, "vvC*iUi", "") BUILTIN(__builtin_altivec_dstt, "vvC*iUi", "")
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