Implement widening for G_SADDO and G_SSUBO.
Add legalize-add/sub tests for narrow overflowing add/sub on AArch64.
Differential Revision: https://reviews.llvm.org/D95034
return widenScalarMergeValues(MI, TypeIdx, WideTy);
case TargetOpcode::G_UNMERGE_VALUES:
return widenScalarUnmergeValues(MI, TypeIdx, WideTy);
+ case TargetOpcode::G_SADDO:
+ case TargetOpcode::G_SSUBO: {
+ if (TypeIdx == 1)
+ return UnableToLegalize; // TODO
+ auto LHSExt = MIRBuilder.buildSExt(WideTy, MI.getOperand(2));
+ auto RHSExt = MIRBuilder.buildSExt(WideTy, MI.getOperand(3));
+ unsigned Opcode = MI.getOpcode() == TargetOpcode::G_SADDO
+ ? TargetOpcode::G_ADD
+ : TargetOpcode::G_SUB;
+ auto NewOp = MIRBuilder.buildInstr(Opcode, {WideTy}, {LHSExt, RHSExt});
+ LLT OrigTy = MRI.getType(MI.getOperand(0).getReg());
+ auto TruncOp = MIRBuilder.buildTrunc(OrigTy, NewOp);
+ auto ExtOp = MIRBuilder.buildSExt(WideTy, TruncOp);
+ // There is no overflow if the re-extended result is the same as NewOp.
+ MIRBuilder.buildICmp(CmpInst::ICMP_NE, MI.getOperand(1), NewOp, ExtOp);
+ // Now trunc the NewOp to the original result.
+ MIRBuilder.buildTrunc(MI.getOperand(0), NewOp);
+ MI.eraseFromParent();
+ return Legalized;
+ }
case TargetOpcode::G_UADDO:
case TargetOpcode::G_USUBO: {
if (TypeIdx == 1)
...
---
+name: test_scalar_uaddo_small
+body: |
+ bb.0.entry:
+ ; CHECK-LABEL: name: test_scalar_uaddo_small
+ ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
+ ; CHECK: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
+ ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
+ ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
+ ; CHECK: [[AND:%[0-9]+]]:_(s32) = G_AND [[TRUNC]], [[C]]
+ ; CHECK: [[TRUNC1:%[0-9]+]]:_(s32) = G_TRUNC [[COPY1]](s64)
+ ; CHECK: [[AND1:%[0-9]+]]:_(s32) = G_AND [[TRUNC1]], [[C]]
+ ; CHECK: [[ADD:%[0-9]+]]:_(s32) = G_ADD [[AND]], [[AND1]]
+ ; CHECK: [[AND2:%[0-9]+]]:_(s32) = G_AND [[ADD]], [[C]]
+ ; CHECK: [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ne), [[ADD]](s32), [[AND2]]
+ ; CHECK: [[ANYEXT:%[0-9]+]]:_(s64) = G_ANYEXT [[ADD]](s32)
+ ; CHECK: [[ANYEXT1:%[0-9]+]]:_(s64) = G_ANYEXT [[ICMP]](s32)
+ ; CHECK: $x0 = COPY [[ANYEXT]](s64)
+ ; CHECK: $x1 = COPY [[ANYEXT1]](s64)
+ %0:_(s64) = COPY $x0
+ %1:_(s64) = COPY $x1
+ %2:_(s8) = G_TRUNC %0(s64)
+ %3:_(s8) = G_TRUNC %1(s64)
+ %4:_(s8), %5:_(s1) = G_UADDO %2, %3
+ %6:_(s64) = G_ANYEXT %4(s8)
+ %7:_(s64) = G_ANYEXT %5(s1)
+ $x0 = COPY %6(s64)
+ $x1 = COPY %7(s64)
+
+...
+---
+name: test_scalar_saddo_small
+body: |
+ bb.0.entry:
+ ; CHECK-LABEL: name: test_scalar_saddo_small
+ ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
+ ; CHECK: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
+ ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
+ ; CHECK: [[SEXT_INREG:%[0-9]+]]:_(s32) = G_SEXT_INREG [[TRUNC]], 8
+ ; CHECK: [[TRUNC1:%[0-9]+]]:_(s32) = G_TRUNC [[COPY1]](s64)
+ ; CHECK: [[SEXT_INREG1:%[0-9]+]]:_(s32) = G_SEXT_INREG [[TRUNC1]], 8
+ ; CHECK: [[ADD:%[0-9]+]]:_(s32) = G_ADD [[SEXT_INREG]], [[SEXT_INREG1]]
+ ; CHECK: [[COPY2:%[0-9]+]]:_(s32) = COPY [[ADD]](s32)
+ ; CHECK: [[SEXT_INREG2:%[0-9]+]]:_(s32) = G_SEXT_INREG [[COPY2]], 8
+ ; CHECK: [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ne), [[ADD]](s32), [[SEXT_INREG2]]
+ ; CHECK: [[ANYEXT:%[0-9]+]]:_(s64) = G_ANYEXT [[ADD]](s32)
+ ; CHECK: [[ANYEXT1:%[0-9]+]]:_(s64) = G_ANYEXT [[ICMP]](s32)
+ ; CHECK: $x0 = COPY [[ANYEXT]](s64)
+ ; CHECK: $x1 = COPY [[ANYEXT1]](s64)
+ %0:_(s64) = COPY $x0
+ %1:_(s64) = COPY $x1
+ %2:_(s8) = G_TRUNC %0(s64)
+ %3:_(s8) = G_TRUNC %1(s64)
+ %4:_(s8), %5:_(s1) = G_SADDO %2, %3
+ %6:_(s64) = G_ANYEXT %4(s8)
+ %7:_(s64) = G_ANYEXT %5(s1)
+ $x0 = COPY %6(s64)
+ $x1 = COPY %7(s64)
+
+...
+---
name: test_scalar_uaddo_32
body: |
bb.0.entry:
# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
# RUN: llc -march=aarch64 -run-pass=legalizer %s -o - | FileCheck %s
+
---
name: test_scalar_sub_big
body: |
...
---
+name: test_scalar_usubo_small
+body: |
+ bb.0.entry:
+ ; CHECK-LABEL: name: test_scalar_usubo_small
+ ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
+ ; CHECK: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
+ ; CHECK: [[C:%[0-9]+]]:_(s32) = G_CONSTANT i32 255
+ ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
+ ; CHECK: [[AND:%[0-9]+]]:_(s32) = G_AND [[TRUNC]], [[C]]
+ ; CHECK: [[TRUNC1:%[0-9]+]]:_(s32) = G_TRUNC [[COPY1]](s64)
+ ; CHECK: [[AND1:%[0-9]+]]:_(s32) = G_AND [[TRUNC1]], [[C]]
+ ; CHECK: [[ADD:%[0-9]+]]:_(s32) = G_ADD [[AND]], [[AND1]]
+ ; CHECK: [[AND2:%[0-9]+]]:_(s32) = G_AND [[ADD]], [[C]]
+ ; CHECK: [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ne), [[ADD]](s32), [[AND2]]
+ ; CHECK: [[ANYEXT:%[0-9]+]]:_(s64) = G_ANYEXT [[ADD]](s32)
+ ; CHECK: [[ANYEXT1:%[0-9]+]]:_(s64) = G_ANYEXT [[ICMP]](s32)
+ ; CHECK: $x0 = COPY [[ANYEXT]](s64)
+ ; CHECK: $x1 = COPY [[ANYEXT1]](s64)
+ %0:_(s64) = COPY $x0
+ %1:_(s64) = COPY $x1
+ %2:_(s8) = G_TRUNC %0(s64)
+ %3:_(s8) = G_TRUNC %1(s64)
+ %4:_(s8), %5:_(s1) = G_UADDO %2, %3
+ %6:_(s64) = G_ANYEXT %4(s8)
+ %7:_(s64) = G_ANYEXT %5(s1)
+ $x0 = COPY %6(s64)
+ $x1 = COPY %7(s64)
+
+...
+---
+name: test_scalar_ssubo_small
+body: |
+ bb.0.entry:
+ ; CHECK-LABEL: name: test_scalar_ssubo_small
+ ; CHECK: [[COPY:%[0-9]+]]:_(s64) = COPY $x0
+ ; CHECK: [[COPY1:%[0-9]+]]:_(s64) = COPY $x1
+ ; CHECK: [[TRUNC:%[0-9]+]]:_(s32) = G_TRUNC [[COPY]](s64)
+ ; CHECK: [[SEXT_INREG:%[0-9]+]]:_(s32) = G_SEXT_INREG [[TRUNC]], 8
+ ; CHECK: [[TRUNC1:%[0-9]+]]:_(s32) = G_TRUNC [[COPY1]](s64)
+ ; CHECK: [[SEXT_INREG1:%[0-9]+]]:_(s32) = G_SEXT_INREG [[TRUNC1]], 8
+ ; CHECK: [[ADD:%[0-9]+]]:_(s32) = G_ADD [[SEXT_INREG]], [[SEXT_INREG1]]
+ ; CHECK: [[COPY2:%[0-9]+]]:_(s32) = COPY [[ADD]](s32)
+ ; CHECK: [[SEXT_INREG2:%[0-9]+]]:_(s32) = G_SEXT_INREG [[COPY2]], 8
+ ; CHECK: [[ICMP:%[0-9]+]]:_(s32) = G_ICMP intpred(ne), [[ADD]](s32), [[SEXT_INREG2]]
+ ; CHECK: [[ANYEXT:%[0-9]+]]:_(s64) = G_ANYEXT [[ADD]](s32)
+ ; CHECK: [[ANYEXT1:%[0-9]+]]:_(s64) = G_ANYEXT [[ICMP]](s32)
+ ; CHECK: $x0 = COPY [[ANYEXT]](s64)
+ ; CHECK: $x1 = COPY [[ANYEXT1]](s64)
+ %0:_(s64) = COPY $x0
+ %1:_(s64) = COPY $x1
+ %2:_(s8) = G_TRUNC %0(s64)
+ %3:_(s8) = G_TRUNC %1(s64)
+ %4:_(s8), %5:_(s1) = G_SADDO %2, %3
+ %6:_(s64) = G_ANYEXT %4(s8)
+ %7:_(s64) = G_ANYEXT %5(s1)
+ $x0 = COPY %6(s64)
+ $x1 = COPY %7(s64)
+
+...
+---
name: test_scalar_ssubo_32
body: |
bb.0.entry: