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aa5c996eda
This the first of a series of patches to add CodeGen support exploiting the instructions of the z13 vector facility. This patch adds support for the native integer vector types (v16i8, v8i16, v4i32, v2i64). When the vector facility is present, we default to the new vector ABI. This is characterized by two major differences: - Vector types are passed/returned in vector registers (except for unnamed arguments of a variable-argument list function). - Vector types are at most 8-byte aligned. The reason for the choice of 8-byte vector alignment is that the hardware is able to efficiently load vectors at 8-byte alignment, and the ABI only guarantees 8-byte alignment of the stack pointer, so requiring any higher alignment for vectors would require dynamic stack re-alignment code. However, for compatibility with old code that may use vector types, when *not* using the vector facility, the old alignment rules (vector types are naturally aligned) remain in use. These alignment rules are not only implemented at the C language level (implemented in clang), but also at the LLVM IR level. This is done by selecting a different DataLayout string depending on whether the vector ABI is in effect or not. Based on a patch by Richard Sandiford. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@236521 91177308-0d34-0410-b5e6-96231b3b80d8
44 lines
1012 B
LLVM
44 lines
1012 B
LLVM
; Test vector byte masks, v2i64 version.
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;
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; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z13 | FileCheck %s
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; Test an all-zeros vector.
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define <2 x i64> @f1() {
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; CHECK-LABEL: f1:
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; CHECK: vgbm %v24, 0
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; CHECK: br %r14
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ret <2 x i64> zeroinitializer
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}
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; Test an all-ones vector.
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define <2 x i64> @f2() {
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; CHECK-LABEL: f2:
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; CHECK: vgbm %v24, 65535
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; CHECK: br %r14
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ret <2 x i64> <i64 -1, i64 -1>
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}
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; Test a mixed vector (mask 0x8c76).
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define <2 x i64> @f3() {
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; CHECK-LABEL: f3:
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; CHECK: vgbm %v24, 35958
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; CHECK: br %r14
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ret <2 x i64> <i64 18374686483966525440, i64 72057589759737600>
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}
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; Test that undefs are treated as zero (mask 0x8c00).
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define <2 x i64> @f4() {
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; CHECK-LABEL: f4:
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; CHECK: vgbm %v24, 35840
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; CHECK: br %r14
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ret <2 x i64> <i64 18374686483966525440, i64 undef>
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}
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; Test that we don't use VGBM if one of the bytes is not 0 or 0xff.
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define <2 x i64> @f5() {
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; CHECK-LABEL: f5:
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; CHECK-NOT: vgbm
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; CHECK: br %r14
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ret <2 x i64> <i64 18374686483966525441, i64 72057589759737600>
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}
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