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[x86] translating "fp" (floating point) instructions from {fadd,fdiv,fmul,fsub,fsubr,fdivr} to {faddp,fdivp,fmulp,fsubp,fsubrp,fdivrp}

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LLVM Missing the following instructions: fadd\fdiv\fmul\fsub\fsubr\fdivr.
GAS and MS supporting this instruction and lowering them in to a faddp\fdivp\fmulp\fsubp\fsubrp\fdivrp instructions.

Differential Revision: http://reviews.llvm.org/D14217

llvm-svn: 252908
This commit is contained in:
Michael Zuckerman 2015-11-12 16:58:51 +00:00
parent e65df4db51
commit b36f5b984e
4 changed files with 44 additions and 0 deletions
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14
lib/Target/X86/AsmParser/X86AsmParser.cpp
View File

@ -2218,6 +2218,20 @@ bool X86AsmParser::ParseInstruction(ParseInstructionInfo &Info, StringRef Name,
(isPrefix && getLexer().is(AsmToken::Slash)))
Parser.Lex();
// This is for gas compatibility and cannot be done in td.
// Adding "p" for some floating point with no argument.
// For example: fsub --> fsubp
bool IsFp =
Name == "fsub" || Name == "fdiv" || Name == "fsubr" || Name == "fdivr";
if (IsFp && Operands.size() == 1) {
const char *Repl = StringSwitch<const char *>(Name)
.Case("fsub", "fsubp")
.Case("fdiv", "fdivp")
.Case("fsubr", "fsubrp")
.Case("fdivr", "fdivrp");
static_cast<X86Operand &>(*Operands[0]).setTokenValue(Repl);
}
// This is a terrible hack to handle "out[bwl]? %al, (%dx)" ->
// "outb %al, %dx". Out doesn't take a memory form, but this is a widely
// documented form in various unofficial manuals, so a lot of code uses it.

2
lib/Target/X86/X86InstrInfo.td
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@ -2793,8 +2793,10 @@ def : InstAlias<"idiv{q}\t{$src, %rax|rax, $src}", (IDIV64m i64mem:$src)>;
// Various unary fpstack operations default to operating on on ST1.
// For example, "fxch" -> "fxch %st(1)"
def : InstAlias<"faddp", (ADD_FPrST0 ST1), 0>;
def: InstAlias<"fadd", (ADD_FPrST0 ST1), 0>;
def : InstAlias<"fsub{|r}p", (SUBR_FPrST0 ST1), 0>;
def : InstAlias<"fsub{r|}p", (SUB_FPrST0 ST1), 0>;
def : InstAlias<"fmul", (MUL_FPrST0 ST1), 0>;
def : InstAlias<"fmulp", (MUL_FPrST0 ST1), 0>;
def : InstAlias<"fdiv{|r}p", (DIVR_FPrST0 ST1), 0>;
def : InstAlias<"fdiv{r|}p", (DIV_FPrST0 ST1), 0>;

14
test/MC/X86/intel-syntax-2.s
View File

@ -15,3 +15,17 @@ _test2:
.att_syntax prefix
movl $255, -4(%rsp)
// CHECK: movl $255, -4(%rsp)
_test3:
fadd
// CHECK: faddp %st(1)
fmul
// CHECK: fmulp %st(1)
fsub
// CHECK: fsubp %st(1)
fsubr
// CHECK: fsubrp %st(1)
fdiv
// CHECK: fdivp %st(1)
fdivr
// CHECK: fdivrp %st(1)

14
test/MC/X86/intel-syntax.s
View File

@ -533,6 +533,20 @@ fsubrp ST(1)
fdivp ST(1)
fdivrp ST(1)
// CHECK: faddp %st(1)
// CHECK: fmulp %st(1)
// CHECK: fsubrp %st(1)
// CHECK: fsubp %st(1)
// CHECK: fdivrp %st(1)
// CHECK: fdivp %st(1)
fadd
fmul
fsub
fsubr
fdiv
fdivr
// CHECK: faddp %st(1)
// CHECK: fmulp %st(1)
// CHECK: fsubrp %st(1)