diff options
Diffstat (limited to 'lib/Target')
| -rw-r--r-- | lib/Target/X86/X86CallingConv.td | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/lib/Target/X86/X86CallingConv.td b/lib/Target/X86/X86CallingConv.td index 77b99056ae..aab2a05770 100644 --- a/lib/Target/X86/X86CallingConv.td +++ b/lib/Target/X86/X86CallingConv.td @@ -158,10 +158,15 @@ def CC_X86_64_C : CallingConv<[ CCIfSubtarget<"hasXMM()", CCAssignToReg<[XMM0, XMM1, XMM2, XMM3, XMM4, XMM5, XMM6, XMM7]>>>, - // The first 8 256-bit vector arguments are passed in YMM registers. - CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64], - CCIfSubtarget<"hasAVX()", - CCAssignToReg<[YMM0, YMM1, YMM2, YMM3, YMM4, YMM5, YMM6, YMM7]>>>, + // The first 8 256-bit vector arguments are passed in YMM registers, unless + // this is a vararg function. + // FIXME: This isn't precisely correct; the x86-64 ABI document says that + // fixed arguments to vararg functions are supposed to be passed in + // registers. Actually modeling that would be a lot of work, though. + CCIfNotVarArg<CCIfType<[v32i8, v16i16, v8i32, v4i64, v8f32, v4f64], + CCIfSubtarget<"hasAVX()", + CCAssignToReg<[YMM0, YMM1, YMM2, YMM3, + YMM4, YMM5, YMM6, YMM7]>>>>, // Integer/FP values get stored in stack slots that are 8 bytes in size and // 8-byte aligned if there are no more registers to hold them. |