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89 lines
2.2 KiB
LLVM
89 lines
2.2 KiB
LLVM
; Test 16-bit byteswaps from memory to registers.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
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declare i16 @llvm.bswap.i16(i16 %a)
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; Check LRVH with no displacement.
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define i16 @f1(ptr %src) {
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; CHECK-LABEL: f1:
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; CHECK: lrvh %r2, 0(%r2)
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; CHECK: br %r14
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%a = load i16, ptr %src
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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; Check the high end of the aligned LRVH range.
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define i16 @f2(ptr %src) {
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; CHECK-LABEL: f2:
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; CHECK: lrvh %r2, 524286(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i16, ptr %src, i64 262143
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%a = load i16, ptr %ptr
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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; Check the next word up, which needs separate address logic.
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; Other sequences besides this one would be OK.
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define i16 @f3(ptr %src) {
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; CHECK-LABEL: f3:
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; CHECK: agfi %r2, 524288
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; CHECK: lrvh %r2, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i16, ptr %src, i64 262144
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%a = load i16, ptr %ptr
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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; Check the high end of the negative aligned LRVH range.
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define i16 @f4(ptr %src) {
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; CHECK-LABEL: f4:
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; CHECK: lrvh %r2, -2(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i16, ptr %src, i64 -1
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%a = load i16, ptr %ptr
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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; Check the low end of the LRVH range.
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define i16 @f5(ptr %src) {
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; CHECK-LABEL: f5:
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; CHECK: lrvh %r2, -524288(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i16, ptr %src, i64 -262144
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%a = load i16, ptr %ptr
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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; Check the next word down, which needs separate address logic.
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; Other sequences besides this one would be OK.
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define i16 @f6(ptr %src) {
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; CHECK-LABEL: f6:
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; CHECK: agfi %r2, -524290
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; CHECK: lrvh %r2, 0(%r2)
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; CHECK: br %r14
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%ptr = getelementptr i16, ptr %src, i64 -262145
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%a = load i16, ptr %ptr
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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; Check that LRVH allows an index.
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define i16 @f7(i64 %src, i64 %index) {
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; CHECK-LABEL: f7:
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; CHECK: lrvh %r2, 524287({{%r3,%r2|%r2,%r3}})
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; CHECK: br %r14
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%add1 = add i64 %src, %index
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%add2 = add i64 %add1, 524287
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%ptr = inttoptr i64 %add2 to ptr
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%a = load i16, ptr %ptr
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%swapped = call i16 @llvm.bswap.i16(i16 %a)
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ret i16 %swapped
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}
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