| ; RUN: llc -mtriple=aarch64-linux-gnu -mcpu=cortex-a57 -verify-machineinstrs < %s | FileCheck %s |
| |
| ; CHECK-LABEL: f_XX: |
| ; CHECK: cbz x[[REG:[0-9]+]], [[BB:.LBB.*]] |
| ; CHECK: [[BB]]: |
| ; CHECK-NOT: mov x[[REG]], xzr |
| define i64 @f_XX(i64 %n, ptr nocapture readonly %P) { |
| entry: |
| %tobool = icmp eq i64 %n, 0 |
| br i1 %tobool, label %if.end, label %if.then |
| |
| if.then: ; preds = %entry |
| %0 = load i64, ptr %P |
| br label %if.end |
| |
| if.end: ; preds = %entry, %if.then |
| %a.0 = phi i64 [ %0, %if.then ], [ 0, %entry ] |
| ret i64 %a.0 |
| } |
| |
| ; CHECK-LABEL: f_WW: |
| ; CHECK: cbz w[[REG:[0-9]+]], [[BB:.LBB.*]] |
| ; CHECK: [[BB]]: |
| ; CHECK-NOT: mov w[[REG]], wzr |
| define i32 @f_WW(i32 %n, ptr nocapture readonly %P) { |
| entry: |
| %tobool = icmp eq i32 %n, 0 |
| br i1 %tobool, label %if.end, label %if.then |
| |
| if.then: ; preds = %entry |
| %0 = load i32, ptr %P |
| br label %if.end |
| |
| if.end: ; preds = %entry, %if.then |
| %a.0 = phi i32 [ %0, %if.then ], [ 0, %entry ] |
| ret i32 %a.0 |
| } |
| |
| ; CHECK-LABEL: f_XW: |
| ; CHECK: cbz x[[REG:[0-9]+]], [[BB:.LBB.*]] |
| ; CHECK: [[BB]]: |
| ; CHECK-NOT: mov w[[REG]], wzr |
| define i32 @f_XW(i64 %n, ptr nocapture readonly %P) { |
| entry: |
| %tobool = icmp eq i64 %n, 0 |
| br i1 %tobool, label %if.end, label %if.then |
| |
| if.then: ; preds = %entry |
| %0 = load i32, ptr %P |
| br label %if.end |
| |
| if.end: ; preds = %entry, %if.then |
| %a.0 = phi i32 [ %0, %if.then ], [ 0, %entry ] |
| ret i32 %a.0 |
| } |
| |
| ; CHECK-LABEL: f_WX: |
| ; CHECK: cbz w[[REG:[0-9]+]], [[BB:.LBB.*]] |
| ; CHECK: [[BB]]: |
| ; CHECK: mov x[[REG]], xzr |
| ; Do not remove the mov in this case because we do not know if the upper bits |
| ; of the X register are zero. |
| define i64 @f_WX(i32 %n, ptr nocapture readonly %P) { |
| entry: |
| %tobool = icmp eq i32 %n, 0 |
| br i1 %tobool, label %if.end, label %if.then |
| |
| if.then: ; preds = %entry |
| %0 = load i64, ptr %P |
| br label %if.end |
| |
| if.end: ; preds = %entry, %if.then |
| %a.0 = phi i64 [ %0, %if.then ], [ 0, %entry ] |
| ret i64 %a.0 |
| } |
| |
| ; CHECK-LABEL: test_superreg: |
| ; CHECK: cbz x[[REG:[0-9]+]], [[BB:.LBB.*]] |
| ; CHECK: [[BB]]: |
| ; CHECK: str x[[REG]], [x1] |
| ; CHECK-NOT: mov w[[REG]], wzr |
| ; Because we returned w0 but x0 was marked live-in to the block, we didn't |
| ; remove the <kill> on the str leading to a verification failure. |
| define i32 @test_superreg(i64 %in, ptr %dest) { |
| %tst = icmp eq i64 %in, 0 |
| br i1 %tst, label %true, label %false |
| |
| false: |
| ret i32 42 |
| |
| true: |
| store volatile i64 %in, ptr %dest |
| ret i32 0 |
| } |