This patch adds a test for the assembly code emitted with XRay
instrumentation. It also fixes a bug where the operand of a jump
instruction must be not the number of bytes to jump over, but rather the
number of 4-byte instructions.
Author: rSerge
Reviewers: dberris, rengolin
Differential Revision: https://reviews.llvm.org/D26805
llvm-svn: 287516
auto Target = OutContext.createTempSymbol();
// Emit "B #32" instruction, which jumps over the next 28 bytes.
- EmitToStreamer(*OutStreamer, MCInstBuilder(AArch64::B).addImm(32));
+ // The operand has to be the number of 4-byte instructions to jump over,
+ // including the current instruction.
+ EmitToStreamer(*OutStreamer, MCInstBuilder(AArch64::B).addImm(8));
for (int8_t I = 0; I < NoopsInSledCount; I++)
EmitToStreamer(*OutStreamer, MCInstBuilder(AArch64::HINT).addImm(0));
--- /dev/null
+; RUN: llc -filetype=asm -o - -mtriple=aarch64-unknown-linux-gnu < %s | FileCheck %s
+
+define i32 @foo() nounwind noinline uwtable "function-instrument"="xray-always" {
+; CHECK-LABEL: Lxray_sled_0:
+; CHECK-NEXT: b #32
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-LABEL: Ltmp0:
+ ret i32 0
+; CHECK-LABEL: Lxray_sled_1:
+; CHECK-NEXT: b #32
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-NEXT: nop
+; CHECK-LABEL: Ltmp1:
+; CHECK-NEXT: ret
+}
+; CHECK: .p2align 4
+; CHECK-NEXT: .xword .Lxray_synthetic_0
+; CHECK-NEXT: .section xray_instr_map,{{.*}}
+; CHECK-LABEL: Lxray_synthetic_0:
+; CHECK: .xword .Lxray_sled_0
+; CHECK: .xword .Lxray_sled_1