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The SPARCv9 ABI returns a float in %f0.

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This is different from the argument passing convention which puts the
first float argument in %f1.

With this patch, all returned floats are treated as if the 'inreg' flag
were set. This means multiple float return values get packed in %f0,
%f1, %f2, ...

Note that when returning a struct in registers, clang will set the
'inreg' flag on the return value, so that behavior is unchanged. This
also happens when returning a float _Complex.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@199028 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2014-01-12 04:13:17 +00:00
parent 86802628de
commit 1655be290c
5 changed files with 20 additions and 11 deletions
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8
test/CodeGen/SPARC/64abi.ll
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@@ -180,7 +180,7 @@ define void @call_inreg_fi(i32* %p, i32 %i1, float %f5) {
}
; CHECK: inreg_ff
; CHECK: fsubs %f0, %f1, %f1
; CHECK: fsubs %f0, %f1, %f0
define float @inreg_ff(float inreg %a0, ; %f0
float inreg %a1) { ; %f1
%rv = fsub float %a0, %a1
@@ -262,10 +262,10 @@ define void @call_ret_i64_pair(i64* %i0) {
ret void
}
; This is not a C struct, each member uses 8 bytes.
; This is not a C struct, the i32 member uses 8 bytes, but the float only 4.
; CHECK: ret_i32_float_pair
; CHECK: ld [%i2], %i0
; CHECK: ld [%i3], %f3
; CHECK: ld [%i3], %f2
define { i32, float } @ret_i32_float_pair(i32 %a0, i32 %a1,
i32* %p, float* %q) {
%r1 = load i32* %p
@@ -279,7 +279,7 @@ define { i32, float } @ret_i32_float_pair(i32 %a0, i32 %a1,
; CHECK: call_ret_i32_float_pair
; CHECK: call ret_i32_float_pair
; CHECK: st %o0, [%i0]
; CHECK: st %f3, [%i1]
; CHECK: st %f2, [%i1]
define void @call_ret_i32_float_pair(i32* %i0, float* %i1) {
%rv = call { i32, float } @ret_i32_float_pair(i32 undef, i32 undef,
i32* undef, float* undef)