mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 20:23:11 +01:00
a62270de2c
The reversion apparently deleted the test/Transforms directory. Will be re-reverting again. llvm-svn: 358552
90 lines
3.0 KiB
LLVM
90 lines
3.0 KiB
LLVM
; RUN: opt < %s -mem2reg -S | FileCheck %s
|
|
|
|
; This tests that mem2reg preserves the !nonnull metadata on loads
|
|
; from allocas that get optimized out.
|
|
|
|
; Check the case where the alloca in question has a single store.
|
|
define float* @single_store(float** %arg) {
|
|
; CHECK-LABEL: define float* @single_store
|
|
; CHECK: %arg.load = load float*, float** %arg, align 8
|
|
; CHECK: [[ASSUME:%(.*)]] = icmp ne float* %arg.load, null
|
|
; CHECK: call void @llvm.assume(i1 {{.*}}[[ASSUME]])
|
|
; CHECK: ret float* %arg.load
|
|
entry:
|
|
%buf = alloca float*
|
|
%arg.load = load float*, float** %arg, align 8
|
|
store float* %arg.load, float** %buf, align 8
|
|
%buf.load = load float*, float **%buf, !nonnull !0
|
|
ret float* %buf.load
|
|
}
|
|
|
|
; Check the case where the alloca in question has more than one
|
|
; store but still within one basic block.
|
|
define float* @single_block(float** %arg) {
|
|
; CHECK-LABEL: define float* @single_block
|
|
; CHECK: %arg.load = load float*, float** %arg, align 8
|
|
; CHECK: [[ASSUME:%(.*)]] = icmp ne float* %arg.load, null
|
|
; CHECK: call void @llvm.assume(i1 {{.*}}[[ASSUME]])
|
|
; CHECK: ret float* %arg.load
|
|
entry:
|
|
%buf = alloca float*
|
|
%arg.load = load float*, float** %arg, align 8
|
|
store float* null, float** %buf, align 8
|
|
store float* %arg.load, float** %buf, align 8
|
|
%buf.load = load float*, float **%buf, !nonnull !0
|
|
ret float* %buf.load
|
|
}
|
|
|
|
; Check the case where the alloca in question has more than one
|
|
; store and also reads ands writes in multiple blocks.
|
|
define float* @multi_block(float** %arg) {
|
|
; CHECK-LABEL: define float* @multi_block
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: %arg.load = load float*, float** %arg, align 8
|
|
; CHECK: br label %next
|
|
; CHECK-LABEL: next:
|
|
; CHECK: [[ASSUME:%(.*)]] = icmp ne float* %arg.load, null
|
|
; CHECK: call void @llvm.assume(i1 {{.*}}[[ASSUME]])
|
|
; CHECK: ret float* %arg.load
|
|
entry:
|
|
%buf = alloca float*
|
|
%arg.load = load float*, float** %arg, align 8
|
|
store float* null, float** %buf, align 8
|
|
br label %next
|
|
next:
|
|
store float* %arg.load, float** %buf, align 8
|
|
%buf.load = load float*, float** %buf, !nonnull !0
|
|
ret float* %buf.load
|
|
}
|
|
|
|
; Check that we don't add an assume if it's not
|
|
; necessary i.e. the value is already implied to be nonnull
|
|
define float* @no_assume(float** %arg) {
|
|
; CHECK-LABEL: define float* @no_assume
|
|
; CHECK-LABEL: entry:
|
|
; CHECK: %arg.load = load float*, float** %arg, align 8
|
|
; CHECK: %cn = icmp ne float* %arg.load, null
|
|
; CHECK: br i1 %cn, label %next, label %fin
|
|
; CHECK-LABEL: next:
|
|
; CHECK-NOT: call void @llvm.assume
|
|
; CHECK: ret float* %arg.load
|
|
; CHECK-LABEL: fin:
|
|
; CHECK: ret float* null
|
|
entry:
|
|
%buf = alloca float*
|
|
%arg.load = load float*, float** %arg, align 8
|
|
%cn = icmp ne float* %arg.load, null
|
|
br i1 %cn, label %next, label %fin
|
|
next:
|
|
; At this point the above nonnull check ensures that
|
|
; the value %arg.load is nonnull in this block and thus
|
|
; we need not add the assume.
|
|
store float* %arg.load, float** %buf, align 8
|
|
%buf.load = load float*, float** %buf, !nonnull !0
|
|
ret float* %buf.load
|
|
fin:
|
|
ret float* null
|
|
}
|
|
|
|
!0 = !{}
|