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8de9a94d5e
These instructions are allowed to trap even if the condition is false, so for now they are only used for "*ptr = (cond ? x : *ptr)"-style constructs. llvm-svn: 187111
187 lines
4.8 KiB
LLVM
187 lines
4.8 KiB
LLVM
; Test STOCs that are presented as selects.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s
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declare void @foo(i32 *)
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; Test the simple case, with the loaded value first.
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define void @f1(i32 *%ptr, i32 %alt, i32 %limit) {
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; CHECK-LABEL: f1:
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, 0(%r2)
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; CHECK: br %r14
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %orig, i32 %alt
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store i32 %res, i32 *%ptr
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ret void
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}
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; ...and with the loaded value second
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define void @f2(i32 *%ptr, i32 %alt, i32 %limit) {
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; CHECK-LABEL: f2:
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; CHECK: clfi %r4, 42
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; CHECK: stocl %r3, 0(%r2)
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; CHECK: br %r14
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %alt, i32 %orig
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store i32 %res, i32 *%ptr
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ret void
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}
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; Test cases where the value is explicitly sign-extended to 64 bits, with the
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; loaded value first.
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define void @f3(i32 *%ptr, i64 %alt, i32 %limit) {
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; CHECK-LABEL: f3:
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, 0(%r2)
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; CHECK: br %r14
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%ext = sext i32 %orig to i64
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%res = select i1 %cond, i64 %ext, i64 %alt
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%trunc = trunc i64 %res to i32
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store i32 %trunc, i32 *%ptr
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ret void
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}
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; ...and with the loaded value second
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define void @f4(i32 *%ptr, i64 %alt, i32 %limit) {
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; CHECK-LABEL: f4:
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; CHECK: clfi %r4, 42
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; CHECK: stocl %r3, 0(%r2)
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; CHECK: br %r14
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%ext = sext i32 %orig to i64
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%res = select i1 %cond, i64 %alt, i64 %ext
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%trunc = trunc i64 %res to i32
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store i32 %trunc, i32 *%ptr
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ret void
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}
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; Test cases where the value is explicitly zero-extended to 32 bits, with the
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; loaded value first.
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define void @f5(i32 *%ptr, i64 %alt, i32 %limit) {
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; CHECK-LABEL: f5:
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, 0(%r2)
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; CHECK: br %r14
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%ext = zext i32 %orig to i64
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%res = select i1 %cond, i64 %ext, i64 %alt
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%trunc = trunc i64 %res to i32
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store i32 %trunc, i32 *%ptr
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ret void
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}
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; ...and with the loaded value second
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define void @f6(i32 *%ptr, i64 %alt, i32 %limit) {
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; CHECK-LABEL: f6:
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; CHECK: clfi %r4, 42
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; CHECK: stocl %r3, 0(%r2)
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; CHECK: br %r14
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%ext = zext i32 %orig to i64
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%res = select i1 %cond, i64 %alt, i64 %ext
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%trunc = trunc i64 %res to i32
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store i32 %trunc, i32 *%ptr
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ret void
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}
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; Check the high end of the aligned STOC range.
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define void @f7(i32 *%base, i32 %alt, i32 %limit) {
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; CHECK-LABEL: f7:
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, 524284(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i32 *%base, i64 131071
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %orig, i32 %alt
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store i32 %res, i32 *%ptr
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ret void
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}
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; Check the next word up. Other sequences besides this one would be OK.
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define void @f8(i32 *%base, i32 %alt, i32 %limit) {
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; CHECK-LABEL: f8:
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; CHECK: agfi %r2, 524288
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i32 *%base, i64 131072
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %orig, i32 %alt
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store i32 %res, i32 *%ptr
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ret void
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}
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; Check the low end of the STOC range.
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define void @f9(i32 *%base, i32 %alt, i32 %limit) {
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; CHECK-LABEL: f9:
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, -524288(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i32 *%base, i64 -131072
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %orig, i32 %alt
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store i32 %res, i32 *%ptr
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ret void
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}
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; Check the next word down, with the same comments as f8.
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define void @f10(i32 *%base, i32 %alt, i32 %limit) {
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; CHECK-LABEL: f10:
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; CHECK: agfi %r2, -524292
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; CHECK: clfi %r4, 42
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; CHECK: stocnl %r3, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i32 *%base, i64 -131073
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %orig, i32 %alt
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store i32 %res, i32 *%ptr
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ret void
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}
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; Try a frame index base.
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define void @f11(i32 %alt, i32 %limit) {
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; CHECK-LABEL: f11:
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; CHECK: brasl %r14, foo@PLT
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; CHECK: stocnl {{%r[0-9]+}}, {{[0-9]+}}(%r15)
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; CHECK: brasl %r14, foo@PLT
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; CHECK: br %r14
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%ptr = alloca i32
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call void @foo(i32 *%ptr)
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%cond = icmp ult i32 %limit, 42
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%orig = load i32 *%ptr
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%res = select i1 %cond, i32 %orig, i32 %alt
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store i32 %res, i32 *%ptr
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call void @foo(i32 *%ptr)
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ret void
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}
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; Test that conditionally-executed stores do not use STOC, since STOC
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; is allowed to trap even when the condition is false.
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define void @f12(i32 %a, i32 %b, i32 *%dest) {
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; CHECK-LABEL: f12:
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; CHECK-NOT: stoc
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; CHECK: br %r14
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entry:
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%cmp = icmp ule i32 %a, %b
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br i1 %cmp, label %store, label %exit
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store:
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store i32 %b, i32 *%dest
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br label %exit
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exit:
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ret void
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}
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