[AArch64] Allow global register asm("x18") or asm("w18") under -ffixed-x18
When using -ffixed-x18, the x18 (or w18) register can safely be used with the "global register variable" GCC extension, but the backend fails to recognize it. Patch by Roland McGrath. Differential Revision: https://reviews.llvm.org/D31793 llvm-svn: 299799
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@ -4510,7 +4510,12 @@ unsigned AArch64TargetLowering::getRegisterByName(const char* RegName, EVT VT,
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SelectionDAG &DAG) const {
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unsigned Reg = StringSwitch<unsigned>(RegName)
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.Case("sp", AArch64::SP)
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.Case("x18", AArch64::X18)
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.Case("w18", AArch64::W18)
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.Default(0);
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if ((Reg == AArch64::X18 || Reg == AArch64::W18) &&
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!Subtarget->isX18Reserved())
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Reg = 0;
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if (Reg)
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return Reg;
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report_fatal_error(Twine("Invalid register name \""
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@ -0,0 +1,14 @@
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; RUN: not llc -mtriple=aarch64-fuchsia -o - %s 2>&1 | FileCheck %s --check-prefix=ERROR
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; RUN: llc -mtriple=aarch64-fuchsia -mattr=+reserve-x18 -o - %s
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define void @set_w18(i32 %x) {
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entry:
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; FIXME: Include an allocatable-specific error message
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; ERROR: Invalid register name "w18".
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tail call void @llvm.write_register.i32(metadata !0, i32 %x)
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ret void
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}
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declare void @llvm.write_register.i32(metadata, i32) nounwind
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!0 = !{!"w18"}
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@ -0,0 +1,14 @@
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; RUN: not llc -mtriple=aarch64-fuchsia -o - %s 2>&1 | FileCheck %s --check-prefix=ERROR
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; RUN: llc -mtriple=aarch64-fuchsia -mattr=+reserve-x18 -o - %s
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define void @set_x18(i64 %x) {
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entry:
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; FIXME: Include an allocatable-specific error message
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; ERROR: Invalid register name "x18".
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tail call void @llvm.write_register.i64(metadata !0, i64 %x)
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ret void
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}
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declare void @llvm.write_register.i64(metadata, i64) nounwind
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!0 = !{!"x18"}
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