smaksimovic created this revision.
Herald added a subscriber: arichardson.
Added options to clang are -mmadd4 and -mno-madd4, used to enable or disable
generation
of madd.fmt and similar instructions respectively, as per GCC.
https://reviews.llvm.org/D33401
Files:
include/clang/Driver/Options.td
lib/Driver/ToolChains/Arch/Mips.cpp
test/CodeGen/mips-madd4.c
Index: test/CodeGen/mips-madd4.c
===================================================================
--- test/CodeGen/mips-madd4.c
+++ test/CodeGen/mips-madd4.c
@@ -0,0 +1,86 @@
+// RUN: %clang --target=mips64-unknown-linux -S -mmadd4 %s -o -| FileCheck %s -check-prefix=MADD4
+// RUN: %clang --target=mips64-unknown-linux -S -mno-madd4 %s -o -| FileCheck %s -check-prefix=NOMADD4
+// RUN: %clang --target=mips64-unknown-linux -S -mmadd4 -fno-honor-nans %s -o -| FileCheck %s -check-prefix=MADD4-NONAN
+// RUN: %clang --target=mips64-unknown-linux -S -mno-madd4 -fno-honor-nans %s -o -| FileCheck %s -check-prefix=NOMADD4-NONAN
+
+float madd_s (float f, float g, float h)
+{
+ return (f * g) + h;
+}
+// MADD4: madd.s
+// NOMADD4: mul.s
+// NOMADD4: add.s
+
+float msub_s (float f, float g, float h)
+{
+ return (f * g) - h;
+}
+// MADD4: msub.s
+// NOMADD4: mul.s
+// NOMADD4: sub.s
+
+double madd_d (double f, double g, double h)
+{
+ return (f * g) + h;
+}
+// MADD4: madd.d
+// NOMADD4: mul.d
+// NOMADD4: add.d
+
+double msub_d (double f, double g, double h)
+{
+ return (f * g) - h;
+}
+// MADD4: msub.d
+// NOMADD4: mul.d
+// NOMADD4: sub.d
+
+
+float nmadd_s (float f, float g, float h)
+{
+ // FIXME: Zero has been explicitly placed to force generation of a positive
+ // zero in IR until pattern used to match this instruction is changed to
+ // comply with negative zero as well.
+ return 0-((f * g) + h);
+}
+// MADD4-NONAN: nmadd.s
+// NOMADD4-NONAN: mul.s
+// NOMADD4-NONAN: add.s
+// NOMADD4-NONAN: sub.s
+
+float nmsub_s (float f, float g, float h)
+{
+ // FIXME: Zero has been explicitly placed to force generation of a positive
+ // zero in IR until pattern used to match this instruction is changed to
+ // comply with negative zero as well.
+ return 0-((f * g) - h);
+}
+// MADD4-NONAN: nmsub.s
+// NOMADD4-NONAN: mul.s
+// NOMADD4-NONAN: sub.s
+// NOMADD4-NONAN: sub.s
+
+double nmadd_d (double f, double g, double h)
+{
+ // FIXME: Zero has been explicitly placed to force generation of a positive
+ // zero in IR until pattern used to match this instruction is changed to
+ // comply with negative zero as well.
+ return 0-((f * g) + h);
+}
+// MADD4-NONAN: nmadd.d
+// NOMADD4-NONAN: mul.d
+// NOMADD4-NONAN: add.d
+// NOMADD4-NONAN: sub.d
+
+double nmsub_d (double f, double g, double h)
+{
+ // FIXME: Zero has been explicitly placed to force generation of a positive
+ // zero in IR until pattern used to match this instruction is changed to
+ // comply with negative zero as well.
+ return 0-((f * g) - h);
+}
+// MADD4-NONAN: nmsub.d
+// NOMADD4-NONAN: mul.d
+// NOMADD4-NONAN: sub.d
+// NOMADD4-NONAN: sub.d
+
Index: lib/Driver/ToolChains/Arch/Mips.cpp
===================================================================
--- lib/Driver/ToolChains/Arch/Mips.cpp
+++ lib/Driver/ToolChains/Arch/Mips.cpp
@@ -298,6 +298,13 @@
AddTargetFeature(Args, Features, options::OPT_mno_odd_spreg,
options::OPT_modd_spreg, "nooddspreg");
+
+ if(Arg *A = Args.getLastArg(options::OPT_mmadd4, options::OPT_mno_madd4)) {
+ if(A->getOption().matches(options::OPT_mmadd4))
+ Features.push_back("+madd4");
+ else
+ Features.push_back("-madd4");
+ }
}
mips::NanEncoding mips::getSupportedNanEncoding(StringRef &CPU) {
Index: include/clang/Driver/Options.td
===================================================================
--- include/clang/Driver/Options.td
+++ include/clang/Driver/Options.td
@@ -1998,6 +1998,10 @@
def mno_dspr2 : Flag<["-"], "mno-dspr2">, Group<m_Group>;
def msingle_float : Flag<["-"], "msingle-float">, Group<m_Group>;
def mdouble_float : Flag<["-"], "mdouble-float">, Group<m_Group>;
+def mmadd4 : Flag<["-"], "mmadd4">, Group<m_Group>,
+ HelpText<"Enable the generation of 4-operand madd.s, madd.d and related instructions.">;
+def mno_madd4 : Flag<["-"], "mno-madd4">, Group<m_Group>,
+ HelpText<"Disable the generation of 4-operand madd.s, madd.d and related instructions.">;
def mmsa : Flag<["-"], "mmsa">, Group<m_Group>,
HelpText<"Enable MSA ASE (MIPS only)">;
def mno_msa : Flag<["-"], "mno-msa">, Group<m_Group>,
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