diff --git a/llvm/lib/CodeGen/GlobalISel/Utils.cpp b/llvm/lib/CodeGen/GlobalISel/Utils.cpp index ca82857319abc..5fab6ec506e94 100644 --- a/llvm/lib/CodeGen/GlobalISel/Utils.cpp +++ b/llvm/lib/CodeGen/GlobalISel/Utils.cpp @@ -1893,6 +1893,8 @@ static bool canCreateUndefOrPoison(Register Reg, const MachineRegisterInfo &MRI, case TargetOpcode::G_UADDSAT: case TargetOpcode::G_SSUBSAT: case TargetOpcode::G_USUBSAT: + case TargetOpcode::G_SBFX: + case TargetOpcode::G_UBFX: return false; case TargetOpcode::G_SSHLSAT: case TargetOpcode::G_USHLSAT: diff --git a/llvm/test/CodeGen/AArch64/GlobalISel/combine-freeze.mir b/llvm/test/CodeGen/AArch64/GlobalISel/combine-freeze.mir index 6b84a8488e478..1950e602ec83a 100644 --- a/llvm/test/CodeGen/AArch64/GlobalISel/combine-freeze.mir +++ b/llvm/test/CodeGen/AArch64/GlobalISel/combine-freeze.mir @@ -1440,3 +1440,50 @@ body: | %freeze:_(<4 x s32>) = G_FREEZE %extract $q0 = COPY %freeze(<4 x s32>) RET_ReallyLR implicit $x0 +... +--- +name: ubfx_does_not_generate_poison +body: | + bb.1: + liveins: $w0 + + ; CHECK-LABEL: name: ubfx_does_not_generate_poison + ; CHECK: liveins: $w0 + ; CHECK-NEXT: {{ $}} + ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(s64) = COPY $x0 + ; CHECK-NEXT: %c1:_(s64) = G_CONSTANT i64 1 + ; CHECK-NEXT: [[FREEZE:%[0-9]+]]:_(s64) = G_FREEZE [[COPY]] + ; CHECK-NEXT: [[UBFX:%[0-9]+]]:_(s64) = G_UBFX [[FREEZE]], %c1(s64), %c1 + ; CHECK-NEXT: $x0 = COPY [[UBFX]](s64) + ; CHECK-NEXT: RET_ReallyLR implicit $x0 + %0:_(s64) = COPY $x0 + %c1:_(s64) = G_CONSTANT i64 1 + %1:_(s64) = G_UBFX %0, %c1, %c1 + %2:_(s64) = G_FREEZE %1 + $x0 = COPY %2(s64) + RET_ReallyLR implicit $x0 + +... +--- +name: sbfx_does_not_generate_poison +body: | + bb.1: + liveins: $w0 + + ; CHECK-LABEL: name: sbfx_does_not_generate_poison + ; CHECK: liveins: $w0 + ; CHECK-NEXT: {{ $}} + ; CHECK-NEXT: [[COPY:%[0-9]+]]:_(s64) = COPY $x0 + ; CHECK-NEXT: %c1:_(s64) = G_CONSTANT i64 1 + ; CHECK-NEXT: [[FREEZE:%[0-9]+]]:_(s64) = G_FREEZE [[COPY]] + ; CHECK-NEXT: [[SBFX:%[0-9]+]]:_(s64) = G_SBFX [[FREEZE]], %c1(s64), %c1 + ; CHECK-NEXT: $x0 = COPY [[SBFX]](s64) + ; CHECK-NEXT: RET_ReallyLR implicit $x0 + %0:_(s64) = COPY $x0 + %c1:_(s64) = G_CONSTANT i64 1 + %1:_(s64) = G_SBFX %0, %c1, %c1 + %2:_(s64) = G_FREEZE %1 + $x0 = COPY %2(s64) + RET_ReallyLR implicit $x0 + +...