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[PowerPC] Unaligned FP default should apply to scalars only
As reported in PR45186, we could be in a situation where we don't want to handle unaligned memory accesses for FP scalars but still have VSX (which allows unaligned access for vectors). Change the default to only apply to scalars. Fixes: https://bugs.llvm.org/show_bug.cgi?id=45186
This commit is contained in:
Nemanja Ivanovic
parent
ba93559438
commit
4cfec1d0af
@ -15659,7 +15659,8 @@ bool PPCTargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
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if (!VT.isSimple())
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return false;
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if (VT.isFloatingPoint() && !Subtarget.allowsUnalignedFPAccess())
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if (VT.isFloatingPoint() && !VT.isVector() &&
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!Subtarget.allowsUnalignedFPAccess())
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return false;
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if (VT.getSimpleVT().isVector()) {
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132
test/CodeGen/PowerPC/pr45186.ll
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132
test/CodeGen/PowerPC/pr45186.ll
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@ -0,0 +1,132 @@
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -ppc-asm-full-reg-names -mtriple=powerpc64-- -mattr=+vsx \
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; RUN: -verify-machineinstrs < %s | FileCheck %s
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%struct.anon = type { i64, i64 }
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@d = local_unnamed_addr global %struct.anon zeroinitializer, align 8
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; Function Attrs: norecurse nounwind readonly
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define i64 @e(i8* nocapture readonly %f) local_unnamed_addr #0 {
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; CHECK-LABEL: e:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: ldx r3, 0, r3
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; CHECK-NEXT: blr
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entry:
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%0 = load i8, i8* %f, align 1
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%conv = zext i8 %0 to i64
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%shl = shl nuw i64 %conv, 56
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%arrayidx1 = getelementptr inbounds i8, i8* %f, i64 1
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%1 = load i8, i8* %arrayidx1, align 1
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%conv2 = zext i8 %1 to i64
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%shl3 = shl nuw nsw i64 %conv2, 48
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%or = or i64 %shl3, %shl
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%arrayidx4 = getelementptr inbounds i8, i8* %f, i64 2
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%2 = load i8, i8* %arrayidx4, align 1
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%conv5 = zext i8 %2 to i64
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%shl6 = shl nuw nsw i64 %conv5, 40
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%or7 = or i64 %or, %shl6
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%arrayidx8 = getelementptr inbounds i8, i8* %f, i64 3
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%3 = load i8, i8* %arrayidx8, align 1
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%conv9 = zext i8 %3 to i64
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%shl10 = shl nuw nsw i64 %conv9, 32
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%or11 = or i64 %or7, %shl10
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%arrayidx12 = getelementptr inbounds i8, i8* %f, i64 4
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%4 = load i8, i8* %arrayidx12, align 1
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%conv13 = zext i8 %4 to i64
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%shl14 = shl nuw nsw i64 %conv13, 24
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%or15 = or i64 %or11, %shl14
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%arrayidx16 = getelementptr inbounds i8, i8* %f, i64 5
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%5 = load i8, i8* %arrayidx16, align 1
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%conv17 = zext i8 %5 to i64
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%shl18 = shl nuw nsw i64 %conv17, 16
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%or20 = or i64 %or15, %shl18
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%arrayidx21 = getelementptr inbounds i8, i8* %f, i64 6
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%6 = load i8, i8* %arrayidx21, align 1
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%conv22 = zext i8 %6 to i64
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%shl23 = shl nuw nsw i64 %conv22, 8
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%or25 = or i64 %or20, %shl23
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%arrayidx26 = getelementptr inbounds i8, i8* %f, i64 7
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%7 = load i8, i8* %arrayidx26, align 1
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%conv27 = zext i8 %7 to i64
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%or28 = or i64 %or25, %conv27
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ret i64 %or28
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}
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; Function Attrs: nofree norecurse nounwind
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define void @g() local_unnamed_addr #0 {
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; CHECK-LABEL: g:
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; CHECK: # %bb.0: # %entry
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; CHECK-NEXT: addis r3, r2, .LC0@toc@ha
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; CHECK-NEXT: addis r4, r2, .LC1@toc@ha
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; CHECK-NEXT: ld r3, .LC0@toc@l(r3)
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; CHECK-NEXT: ld r4, .LC1@toc@l(r4)
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; CHECK-NEXT: lxvd2x vs0, 0, r3
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; CHECK-NEXT: stxvd2x vs0, 0, r4
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; CHECK-NEXT: blr
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entry:
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%0 = load i8, i8* getelementptr inbounds (i8, i8* bitcast (void ()* @g to i8*), i64 8), align 1
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%conv.i = zext i8 %0 to i64
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%shl.i = shl nuw i64 %conv.i, 56
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%1 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 9), align 1
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%conv2.i = zext i8 %1 to i64
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%shl3.i = shl nuw nsw i64 %conv2.i, 48
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%or.i = or i64 %shl3.i, %shl.i
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%2 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 10), align 1
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%conv5.i = zext i8 %2 to i64
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%shl6.i = shl nuw nsw i64 %conv5.i, 40
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%or7.i = or i64 %or.i, %shl6.i
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%3 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 11), align 1
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%conv9.i = zext i8 %3 to i64
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%shl10.i = shl nuw nsw i64 %conv9.i, 32
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%or11.i = or i64 %or7.i, %shl10.i
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%4 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 12), align 1
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%conv13.i = zext i8 %4 to i64
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%shl14.i = shl nuw nsw i64 %conv13.i, 24
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%or15.i = or i64 %or11.i, %shl14.i
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%5 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 13), align 1
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%conv17.i = zext i8 %5 to i64
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%shl18.i = shl nuw nsw i64 %conv17.i, 16
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%or20.i = or i64 %or15.i, %shl18.i
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%6 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 14), align 1
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%conv22.i = zext i8 %6 to i64
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%shl23.i = shl nuw nsw i64 %conv22.i, 8
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%or25.i = or i64 %or20.i, %shl23.i
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%7 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 15), align 1
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%conv27.i = zext i8 %7 to i64
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%or28.i = or i64 %or25.i, %conv27.i
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store i64 %or28.i, i64* getelementptr inbounds (%struct.anon, %struct.anon* @d, i64 0, i32 1), align 8
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%8 = load i8, i8* bitcast (void ()* @g to i8*), align 1
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%conv.i2 = zext i8 %8 to i64
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%shl.i3 = shl nuw i64 %conv.i2, 56
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%9 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 1), align 1
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%conv2.i4 = zext i8 %9 to i64
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%shl3.i5 = shl nuw nsw i64 %conv2.i4, 48
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%or.i6 = or i64 %shl3.i5, %shl.i3
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%10 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 2), align 1
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%conv5.i7 = zext i8 %10 to i64
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%shl6.i8 = shl nuw nsw i64 %conv5.i7, 40
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%or7.i9 = or i64 %or.i6, %shl6.i8
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%11 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 3), align 1
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%conv9.i10 = zext i8 %11 to i64
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%shl10.i11 = shl nuw nsw i64 %conv9.i10, 32
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%or11.i12 = or i64 %or7.i9, %shl10.i11
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%12 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 4), align 1
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%conv13.i13 = zext i8 %12 to i64
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%shl14.i14 = shl nuw nsw i64 %conv13.i13, 24
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%or15.i15 = or i64 %or11.i12, %shl14.i14
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%13 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 5), align 1
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%conv17.i16 = zext i8 %13 to i64
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%shl18.i17 = shl nuw nsw i64 %conv17.i16, 16
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%or20.i18 = or i64 %or15.i15, %shl18.i17
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%14 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 6), align 1
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%conv22.i19 = zext i8 %14 to i64
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%shl23.i20 = shl nuw nsw i64 %conv22.i19, 8
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%or25.i21 = or i64 %or20.i18, %shl23.i20
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%15 = load i8, i8* getelementptr (i8, i8* bitcast (void ()* @g to i8*), i64 7), align 1
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%conv27.i22 = zext i8 %15 to i64
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%or28.i23 = or i64 %or25.i21, %conv27.i22
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store i64 %or28.i23, i64* getelementptr inbounds (%struct.anon, %struct.anon* @d, i64 0, i32 0), align 8
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ret void
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}
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attributes #0 = { nounwind }
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