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8489fbb9a7
This fixes an issue triggered by the following code, where emitEpilogue
got confused when trying to restore the SVE registers after the call,
whereas the call to bar() is implemented as a TCReturn:
int non_sve();
int sve(svint32_t x) { return non_sve(); }
Reviewed By: efriedma
Differential Revision: https://reviews.llvm.org/D84869
108 lines
5.7 KiB
LLVM
108 lines
5.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc -mtriple=aarch64 -mattr=+sve < %s 2>%t | FileCheck %s
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; RUN: FileCheck --check-prefix=WARN --allow-empty %s <%t
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; If this check fails please read test/CodeGen/AArch64/README for instructions on how to resolve it.
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; WARN-NOT: warning
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; Check that a tail call from an SVE function to another SVE function
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; can use a tail-call, as the same registers will be preserved by the
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; callee.
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define <vscale x 4 x i32> @sve_caller_sve_callee() nounwind {
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; CHECK-LABEL: sve_caller_sve_callee:
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; CHECK: // %bb.0:
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; CHECK-NEXT: str x29, [sp, #-16]! // 8-byte Folded Spill
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; CHECK-NEXT: addvl sp, sp, #-2
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; CHECK-NEXT: str z10, [sp] // 16-byte Folded Spill
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; CHECK-NEXT: str z9, [sp, #1, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: //APP
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; CHECK-NEXT: //NO_APP
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; CHECK-NEXT: ldr z10, [sp] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z9, [sp, #1, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: addvl sp, sp, #2
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; CHECK-NEXT: ldr x29, [sp], #16 // 8-byte Folded Reload
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; CHECK-NEXT: b sve_callee
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tail call void asm sideeffect "", "~{z9},~{z10}"()
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%call = tail call <vscale x 4 x i32> @sve_callee()
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ret <vscale x 4 x i32> %call
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}
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declare <vscale x 4 x i32> @sve_callee()
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; Check that a tail call from an SVE function to a non-SVE function
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; does not use a tail-call, because after the call many of the SVE
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; registers may be clobbered and needs to be restored.
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define i32 @sve_caller_non_sve_callee(<vscale x 4 x i32> %arg) nounwind {
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; CHECK-LABEL: sve_caller_non_sve_callee:
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; CHECK: // %bb.0:
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; CHECK-NEXT: stp x29, x30, [sp, #-16]! // 16-byte Folded Spill
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; CHECK-NEXT: addvl sp, sp, #-18
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; CHECK-NEXT: str p15, [sp, #4, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p14, [sp, #5, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p13, [sp, #6, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p12, [sp, #7, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p11, [sp, #8, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p10, [sp, #9, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p9, [sp, #10, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p8, [sp, #11, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p7, [sp, #12, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p6, [sp, #13, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p5, [sp, #14, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str p4, [sp, #15, mul vl] // 2-byte Folded Spill
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; CHECK-NEXT: str z23, [sp, #2, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z22, [sp, #3, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z21, [sp, #4, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z20, [sp, #5, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z19, [sp, #6, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z18, [sp, #7, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z17, [sp, #8, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z16, [sp, #9, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z15, [sp, #10, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z14, [sp, #11, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z13, [sp, #12, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z12, [sp, #13, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z11, [sp, #14, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z10, [sp, #15, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z9, [sp, #16, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: str z8, [sp, #17, mul vl] // 16-byte Folded Spill
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; CHECK-NEXT: //APP
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; CHECK-NEXT: //NO_APP
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; CHECK-NEXT: bl non_sve_callee
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; CHECK-NEXT: ldr p15, [sp, #4, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p14, [sp, #5, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p13, [sp, #6, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p12, [sp, #7, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p11, [sp, #8, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p10, [sp, #9, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p9, [sp, #10, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p8, [sp, #11, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p7, [sp, #12, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p6, [sp, #13, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p5, [sp, #14, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr p4, [sp, #15, mul vl] // 2-byte Folded Reload
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; CHECK-NEXT: ldr z23, [sp, #2, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z22, [sp, #3, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z21, [sp, #4, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z20, [sp, #5, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z19, [sp, #6, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z18, [sp, #7, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z17, [sp, #8, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z16, [sp, #9, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z15, [sp, #10, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z14, [sp, #11, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z13, [sp, #12, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z12, [sp, #13, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z11, [sp, #14, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z10, [sp, #15, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z9, [sp, #16, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: ldr z8, [sp, #17, mul vl] // 16-byte Folded Reload
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; CHECK-NEXT: addvl sp, sp, #18
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; CHECK-NEXT: ldp x29, x30, [sp], #16 // 16-byte Folded Reload
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; CHECK-NEXT: ret
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tail call void asm sideeffect "", "~{z9},~{z10}"()
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%call = tail call i32 @non_sve_callee()
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ret i32 %call
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}
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declare i32 @non_sve_callee()
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