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[DAG] SelectionDAG::canCreateUndefOrPoison - add ISD::FCOPYSIGN #148617

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Merged
merged 1 commit into from
Jul 14, 2025
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[DAG] SelectionDAG::canCreateUndefOrPoison - add ISD::FCOPYSIGN #148617

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1 change: 1 addition & 0 deletions llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5620,6 +5620,7 @@ bool SelectionDAG::canCreateUndefOrPoison(SDValue Op, const APInt &DemandedElts,
case ISD::FMUL:
case ISD::FDIV:
case ISD::FREM:
case ISD::FCOPYSIGN:
// No poison except from flags (which is handled above)
return false;

Expand Down
29 changes: 23 additions & 6 deletions llvm/test/CodeGen/PowerPC/copysignl.ll
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Expand Up @@ -20,6 +20,23 @@ entry:
ret double %conv
}

define double @foo_d_ll_freeze(ppc_fp128 %a, ppc_fp128 %b) #0 {
; CHECK-LABEL: foo_d_ll_freeze:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: fcpsgn 1, 3, 1
; CHECK-NEXT: blr
;
; CHECK-VSX-LABEL: foo_d_ll_freeze:
; CHECK-VSX: # %bb.0: # %entry
; CHECK-VSX-NEXT: xscpsgndp 1, 3, 1
; CHECK-VSX-NEXT: blr
entry:
%call = tail call ppc_fp128 @copysignl(ppc_fp128 %a, ppc_fp128 %b) #0
%freeze = freeze ppc_fp128 %call
%conv = fptrunc ppc_fp128 %freeze to double
ret double %conv
}

declare ppc_fp128 @copysignl(ppc_fp128, ppc_fp128) #0

define double @foo_dl(double %a, ppc_fp128 %b) #0 {
Expand All @@ -46,9 +63,9 @@ define ppc_fp128 @foo_ll(double %a, ppc_fp128 %b) #0 {
; CHECK-NEXT: mflr 0
; CHECK-NEXT: stdu 1, -112(1)
; CHECK-NEXT: fmr 3, 2
; CHECK-NEXT: addis 3, 2, .LCPI2_0@toc@ha
; CHECK-NEXT: addis 3, 2, .LCPI3_0@toc@ha
; CHECK-NEXT: std 0, 128(1)
; CHECK-NEXT: lfs 2, .LCPI2_0@toc@l(3)
; CHECK-NEXT: lfs 2, .LCPI3_0@toc@l(3)
; CHECK-NEXT: bl copysignl
; CHECK-NEXT: nop
; CHECK-NEXT: addi 1, 1, 112
Expand Down Expand Up @@ -81,9 +98,9 @@ define ppc_fp128 @foo_ld(double %a, double %b) #0 {
; CHECK-NEXT: mflr 0
; CHECK-NEXT: stdu 1, -112(1)
; CHECK-NEXT: fmr 3, 2
; CHECK-NEXT: addis 3, 2, .LCPI3_0@toc@ha
; CHECK-NEXT: addis 3, 2, .LCPI4_0@toc@ha
; CHECK-NEXT: std 0, 128(1)
; CHECK-NEXT: lfs 2, .LCPI3_0@toc@l(3)
; CHECK-NEXT: lfs 2, .LCPI4_0@toc@l(3)
; CHECK-NEXT: bl copysignl
; CHECK-NEXT: nop
; CHECK-NEXT: addi 1, 1, 112
Expand Down Expand Up @@ -117,9 +134,9 @@ define ppc_fp128 @foo_lf(double %a, float %b) #0 {
; CHECK-NEXT: mflr 0
; CHECK-NEXT: stdu 1, -112(1)
; CHECK-NEXT: fmr 3, 2
; CHECK-NEXT: addis 3, 2, .LCPI4_0@toc@ha
; CHECK-NEXT: addis 3, 2, .LCPI5_0@toc@ha
; CHECK-NEXT: std 0, 128(1)
; CHECK-NEXT: lfs 2, .LCPI4_0@toc@l(3)
; CHECK-NEXT: lfs 2, .LCPI5_0@toc@l(3)
; CHECK-NEXT: bl copysignl
; CHECK-NEXT: nop
; CHECK-NEXT: addi 1, 1, 112
Expand Down
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