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When a live virtual register is being clobbered by an implicit def, it is spilled

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and the spill is its kill. However, if the local allocator has determined the
register has not been modified (possible when its value was reloaded), it would
not issue a restore. In that case, mark the last use of the virtual register as
kill.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46111 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-01-17 02:08:17 +00:00
parent ab04e13a1f
commit 839b759c38
2 changed files with 55 additions and 2 deletions
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35
test/CodeGen/X86/2008-01-16-FPStackifierAssert.ll Normal file
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; RUN: llvm-as < %s | llc -march=x86 -mattr=+sse2 -regalloc=local
define void @SolveCubic(double %a, double %b, double %c, double %d, i32* %solutions, double* %x) {
entry:
%tmp71 = load x86_fp80* null, align 16 ; <x86_fp80> [#uses=1]
%tmp72 = fdiv x86_fp80 %tmp71, 0xKC000C000000000000000 ; <x86_fp80> [#uses=1]
%tmp73 = add x86_fp80 0xK00000000000000000000, %tmp72 ; <x86_fp80> [#uses=1]
%tmp7374 = fptrunc x86_fp80 %tmp73 to double ; <double> [#uses=1]
store double %tmp7374, double* null, align 8
%tmp81 = load double* null, align 8 ; <double> [#uses=1]
%tmp82 = add double %tmp81, 0x401921FB54442D18 ; <double> [#uses=1]
%tmp83 = fdiv double %tmp82, 3.000000e+00 ; <double> [#uses=1]
%tmp84 = call double @cos( double %tmp83 ) ; <double> [#uses=1]
%tmp85 = mul double 0.000000e+00, %tmp84 ; <double> [#uses=1]
%tmp8586 = fpext double %tmp85 to x86_fp80 ; <x86_fp80> [#uses=1]
%tmp87 = load x86_fp80* null, align 16 ; <x86_fp80> [#uses=1]
%tmp88 = fdiv x86_fp80 %tmp87, 0xKC000C000000000000000 ; <x86_fp80> [#uses=1]
%tmp89 = add x86_fp80 %tmp8586, %tmp88 ; <x86_fp80> [#uses=1]
%tmp8990 = fptrunc x86_fp80 %tmp89 to double ; <double> [#uses=1]
store double %tmp8990, double* null, align 8
%tmp97 = load double* null, align 8 ; <double> [#uses=1]
%tmp98 = add double %tmp97, 0x402921FB54442D18 ; <double> [#uses=1]
%tmp99 = fdiv double %tmp98, 3.000000e+00 ; <double> [#uses=1]
%tmp100 = call double @cos( double %tmp99 ) ; <double> [#uses=1]
%tmp101 = mul double 0.000000e+00, %tmp100 ; <double> [#uses=1]
%tmp101102 = fpext double %tmp101 to x86_fp80 ; <x86_fp80> [#uses=1]
%tmp103 = load x86_fp80* null, align 16 ; <x86_fp80> [#uses=1]
%tmp104 = fdiv x86_fp80 %tmp103, 0xKC000C000000000000000 ; <x86_fp80> [#uses=1]
%tmp105 = add x86_fp80 %tmp101102, %tmp104 ; <x86_fp80> [#uses=1]
%tmp105106 = fptrunc x86_fp80 %tmp105 to double ; <double> [#uses=1]
store double %tmp105106, double* null, align 8
ret void
}
declare double @cos(double)