| ; RUN: llc -mtriple="arm64-apple-ios" < %s | FileCheck %s |
| ; |
| ; Check that the dead register definition pass is considering implicit defs. |
| ; When rematerializing through truncates, the coalescer may produce instructions |
| ; with dead defs, but live implicit-defs of subregs: |
| ; E.g. %X1<def, dead> = MOVi64imm 2, %W1<imp-def>; %X1:GPR64, %W1:GPR32 |
| ; These instructions are live, and their definitions should not be rewritten. |
| ; |
| ; <rdar://problem/16492408> |
| |
| define void @testcase() { |
| ; CHECK: testcase: |
| ; CHECK-NOT: orr xzr, xzr, #0x2 |
| |
| bb1: |
| %tmp1 = tail call float @ceilf(float 2.000000e+00) |
| %tmp2 = fptoui float %tmp1 to i64 |
| br i1 undef, label %bb2, label %bb3 |
| |
| bb2: |
| tail call void @foo() |
| br label %bb3 |
| |
| bb3: |
| %tmp3 = trunc i64 %tmp2 to i32 |
| tail call void @bar(i32 %tmp3) |
| ret void |
| } |
| |
| declare void @foo() |
| declare void @bar(i32) |
| declare float @ceilf(float) nounwind readnone |
