Make stackmap machineinstrs clobber the scratch regs too.
Patchpoints already did this. Doing it for stackmaps is a convenience
for the runtime in the event that it needs to scratch register to
patch or perform a runtime call thunk.
Unlike patchpoints, we just assume the AnyRegCC calling
convention. This is the only language and target independent calling
convention specific to stackmaps so makes sense. Although the calling
convention is not currently used to select the scratch registers.
llvm-svn: 202943
diff --git a/llvm/test/CodeGen/X86/stackmap.ll b/llvm/test/CodeGen/X86/stackmap.ll
index 2b7bb18..cfd0c6e 100644
--- a/llvm/test/CodeGen/X86/stackmap.ll
+++ b/llvm/test/CodeGen/X86/stackmap.ll
@@ -6,7 +6,7 @@
; CHECK-NEXT: __LLVM_StackMaps:
; CHECK-NEXT: .long 0
; Num Functions
-; CHECK-NEXT: .long 14
+; CHECK-NEXT: .long 15
; CHECK-NEXT: .long _constantargs
; CHECK-NEXT: .long 8
; CHECK-NEXT: .long _osrinline
@@ -35,13 +35,15 @@
; CHECK-NEXT: .long 56
; CHECK-NEXT: .long _longid
; CHECK-NEXT: .long 8
+; CHECK-NEXT: .long _clobberScratch
+; CHECK-NEXT: .long 56
; Num LargeConstants
; CHECK-NEXT: .long 3
; CHECK-NEXT: .quad 2147483648
; CHECK-NEXT: .quad 4294967295
; CHECK-NEXT: .quad 4294967296
; Num Callsites
-; CHECK-NEXT: .long 18
+; CHECK-NEXT: .long 19
; Constant arguments
;
@@ -436,6 +438,24 @@
ret void
}
+; Map a value when R11 is the only free register.
+; The scratch register should not be used for a live stackmap value.
+;
+; CHECK-LABEL: .long L{{.*}}-_clobberScratch
+; CHECK-NEXT: .short 0
+; 1 location
+; CHECK-NEXT: .short 1
+; Loc 0: Indirect fp - offset
+; CHECK-NEXT: .byte 3
+; CHECK-NEXT: .byte 4
+; CHECK-NEXT: .short 6
+; CHECK-NEXT: .long -{{[0-9]+}}
+define void @clobberScratch(i32 %a) {
+ tail call void asm sideeffect "nop", "~{ax},~{bx},~{cx},~{dx},~{bp},~{si},~{di},~{r8},~{r9},~{r10},~{r12},~{r13},~{r14},~{r15}"() nounwind
+ tail call void (i64, i32, ...)* @llvm.experimental.stackmap(i64 16, i32 8, i32 %a)
+ ret void
+}
+
declare void @llvm.experimental.stackmap(i64, i32, ...)
declare void @llvm.experimental.patchpoint.void(i64, i32, i8*, i32, ...)
declare i64 @llvm.experimental.patchpoint.i64(i64, i32, i8*, i32, ...)