12629324a4
Add generic instructions for load complement, load negative and load positive for fp32 and fp64, and let isel prefer them. They do not clobber CC, and so give scheduler more freedom. SystemZElimCompare pass will convert them when it can to the CC-setting variants. Regression tests updated to expect the new opcodes in places where the old ones where used. New test case SystemZ/fp-cmp-05.ll checks that SystemZCompareElim.cpp can handle the new opcodes. README.txt updated (bullet removed). Note that fp128 is not yet handled, because it is relatively rare, and is a bit trickier, because of the fact that l.dfr would operate on the sign bit of one of the subregisters of a fp128, but we would not want to copy the other sub-reg in case src and dst regs are not the same. Reviewed by Ulrich Weigand. llvm-svn: 249046
82 lines
2.1 KiB
LLVM
82 lines
2.1 KiB
LLVM
; Test that floating-point instructions that set cc are used to
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; eliminate compares for load complement, load negative and load
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; positive. Right now, the WFL.DB (vector) instructions are not
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; handled by SystemZElimcompare, so for Z13 this is currently
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; unimplemented.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z10 | FileCheck %s -check-prefix=CHECK-Z10
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; Load complement (sign-bit flipped).
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; Test f32
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define float @f1(float %a, float %b, float %f) {
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; CHECK-LABEL: f1:
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; CHECK-Z10: lcebr
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; CHECK-Z10-NEXT: je
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%neg = fsub float -0.0, %f
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%cond = fcmp oeq float %neg, 0.0
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%res = select i1 %cond, float %a, float %b
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ret float %res
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}
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; Test f64
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define double @f2(double %a, double %b, double %f) {
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; CHECK-LABEL: f2:
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; CHECK-Z10: lcdbr
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; CHECK-Z10-NEXT: je
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%neg = fsub double -0.0, %f
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%cond = fcmp oeq double %neg, 0.0
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%res = select i1 %cond, double %a, double %b
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ret double %res
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}
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; Negation of floating-point absolute.
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; Test f32
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declare float @llvm.fabs.f32(float %f)
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define float @f3(float %a, float %b, float %f) {
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; CHECK-LABEL: f3:
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; CHECK-Z10: lnebr
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; CHECK-Z10-NEXT: je
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%abs = call float @llvm.fabs.f32(float %f)
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%neg = fsub float -0.0, %abs
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%cond = fcmp oeq float %neg, 0.0
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%res = select i1 %cond, float %a, float %b
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ret float %res
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}
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; Test f64
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declare double @llvm.fabs.f64(double %f)
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define double @f4(double %a, double %b, double %f) {
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; CHECK-LABEL: f4:
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; CHECK-Z10: lndbr
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; CHECK-Z10-NEXT: je
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%abs = call double @llvm.fabs.f64(double %f)
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%neg = fsub double -0.0, %abs
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%cond = fcmp oeq double %neg, 0.0
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%res = select i1 %cond, double %a, double %b
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ret double %res
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}
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; Absolute floating-point value.
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; Test f32
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define float @f5(float %a, float %b, float %f) {
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; CHECK-LABEL: f5:
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; CHECK-Z10: lpebr
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; CHECK-Z10-NEXT: je
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%abs = call float @llvm.fabs.f32(float %f)
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%cond = fcmp oeq float %abs, 0.0
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%res = select i1 %cond, float %a, float %b
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ret float %res
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}
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; Test f64
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define double @f6(double %a, double %b, double %f) {
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; CHECK-LABEL: f6:
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; CHECK-Z10: lpdbr
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; CHECK-Z10-NEXT: je
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%abs = call double @llvm.fabs.f64(double %f)
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%cond = fcmp oeq double %abs, 0.0
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%res = select i1 %cond, double %a, double %b
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ret double %res
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}
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