6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-07-24 22:24:54 +00:00
Code Issues Projects Releases Wiki Activity

Don't clobber pending ST regs when FP regs are killed.

Browse Source 
X86FloatingPoint keeps track of pending ST registers for an upcoming
inline asm instruction with fixed stack register constraints.  It does
this by remembering which FP register holds the value that should appear
at a fixed stack position for the inline asm.

When that FP register is killed before the inline asm, make sure to
duplicate it to a scratch register, so the ST register still has a live
FP reference.

This could happen when the same FP register was copied to two ST
registers, or when a spill instruction is inserted between the ST copy
and the inline asm.

This fixes PR10602.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137050 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-08-08 17:15:43 +00:00
parent bf13ee1941
commit 66b0f515d5
2 changed files with 31 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
test/CodeGen/X86/inline-asm-fpstack.ll
View File

@@ -329,3 +329,14 @@ entry:
%asmresult = extractvalue %complex %0, 0
ret float %asmresult
}
; Pass the same value in two fixed stack slots.
; CHECK: PR10602
; CHECK: flds LCPI
; CHECK: fld %st(0)
; CHECK: fcomi %st(1), %st(0)
define i32 @PR10602() nounwind ssp {
entry:
%0 = tail call i32 asm "fcomi $2, $1; pushf; pop $0", "=r,{st},{st(1)},~{dirflag},~{fpsr},~{flags}"(double 2.000000e+00, double 2.000000e+00) nounwind
ret i32 %0
}