| ; Test the allocation of emergency spill slots. |
| ; |
| ; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s |
| |
| ; For frames of size less than 4096 - 2*160, no emercengy spill slot |
| ; is required. Check the maximum such case. |
| define void @f1(i64 %x) { |
| ; CHECK-LABEL: f1: |
| ; CHECK: stg %r2, 160(%r15) |
| ; CHECK: br %r14 |
| %y = alloca [471 x i64], align 8 |
| store volatile i64 %x, ptr %y |
| ret void |
| } |
| |
| ; If the frame size is at least 4096 - 2*160, we do need the emergency |
| ; spill slots. Check the minimum such case. |
| define void @f2(i64 %x) { |
| ; CHECK-LABEL: f2: |
| ; CHECK: stg %r2, 176(%r15) |
| ; CHECK: br %r14 |
| %y = alloca [472 x i64], align 8 |
| store volatile i64 %x, ptr %y |
| ret void |
| } |
| |
| ; However, if there are incoming stack arguments, those also need to be |
| ; in reach, so the maximum frame size without emergency spill slots is |
| ; 4096 - 2*160 - <size of incoming stack arguments>. Check the maximum |
| ; case where we still need no emergency spill slots ... |
| define void @f3(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack) { |
| ; CHECK-LABEL: f3: |
| ; CHECK: stg %r2, 160(%r15) |
| ; CHECK: br %r14 |
| %y = alloca [470 x i64], align 8 |
| store volatile i64 %x, ptr %y |
| ret void |
| } |
| |
| ; ... and the minimum case where we do. |
| define void @f4(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack) { |
| ; CHECK-LABEL: f4: |
| ; CHECK: stg %r2, 176(%r15) |
| ; CHECK: br %r14 |
| %y = alloca [471 x i64], align 8 |
| store volatile i64 %x, ptr %y |
| ret void |
| } |
| |
| ; Try again for the case of two stack arguments. |
| ; Check the maximum case where we still need no emergency spill slots ... |
| define void @f5(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack1, i64 %stack2) { |
| ; CHECK-LABEL: f5: |
| ; CHECK: stg %r2, 160(%r15) |
| ; CHECK: br %r14 |
| %y = alloca [469 x i64], align 8 |
| store volatile i64 %x, ptr %y |
| ret void |
| } |
| |
| ; ... and the minimum case where we do. |
| define void @f6(i64 %x, i64 %r3, i64 %r4, i64 %r5, i64 %r6, i64 %stack1, i64 %stack2) { |
| ; CHECK-LABEL: f6: |
| ; CHECK: stg %r2, 176(%r15) |
| ; CHECK: br %r14 |
| %y = alloca [470 x i64], align 8 |
| store volatile i64 %x, ptr %y |
| ret void |
| } |
| |