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Add another non-commutable instruction that gas accepts commuted forms for.

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Fixes PR8861.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122641 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2010-12-30 22:10:49 +00:00
parent d34f19f7ba
commit c00210cef2
2 changed files with 8 additions and 3 deletions
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7
lib/Target/X86/X86InstrInfo.td
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@ -1465,14 +1465,15 @@ defm : FpUnaryAlias<"fucompi", UCOM_FIPr>;
// Handle "f{mulp,addp} st(0), $op" the same as "f{mulp,addp} $op", since they
// commute. We also allow fdivrp/fsubrp even though they don't commute, solely
// because gas supports it.
// commute. We also allow fdiv[r]p/fsubrp even though they don't commute,
// solely because gas supports it.
def : InstAlias<"faddp %st(0), $op", (ADD_FPrST0 RST:$op)>;
def : InstAlias<"fmulp %st(0), $op", (MUL_FPrST0 RST:$op)>;
def : InstAlias<"fsubrp %st(0), $op", (SUB_FPrST0 RST:$op)>;
def : InstAlias<"fdivp %st(0), $op", (DIVR_FPrST0 RST:$op)>;
def : InstAlias<"fdivrp %st(0), $op", (DIV_FPrST0 RST:$op)>;
// We accepts "fnstsw %eax" even though it only writes %ax.
// We accept "fnstsw %eax" even though it only writes %ax.
def : InstAlias<"fnstsw %eax", (FNSTSW8r)>;
def : InstAlias<"fnstsw %al" , (FNSTSW8r)>;
def : InstAlias<"fnstsw" , (FNSTSW8r)>;

4
test/MC/X86/x86-64.s
View File

@ -504,6 +504,10 @@ fdivrp %st(1), %st(0) // CHECK: encoding: [0xde,0xf9]
fsubrp %ST(0), %ST(1) // CHECK: encoding: [0xde,0xe9]
fsubrp %ST(1), %ST(0) // CHECK: encoding: [0xde,0xe9]
// also PR8861
fdivp %st(0), %st(1) // CHECK: encoding: [0xde,0xf1]
fdivp %st(1), %st(0) // CHECK: encoding: [0xde,0xf1]
movl foo(%rip), %eax
// CHECK: movl foo(%rip), %eax