Merged r195973:

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r195973 | dsanders | 2013-11-30 13:47:57 +0000 (Sat, 30 Nov 2013) | 5 lines

[mips][msa] MSA loads and stores have a 10-bit offset. Account for this when lowering FrameIndex.

This prevents the compiler from emitting invalid ld.[bhwd]'s and st.[bhwd]'s
when the stack frame is between 512 and 32,768 bytes in size.

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Review of this commit by Matheus Almeida revealed that it is still possible to
emit invalid code (when the offset is not a multiple of the element size).
However, we agreed that this commit still represents an improvement since it
fixes many cases that previously emitted invalid code, and does not cause any
cases that previously emitted valid code to emit invalid code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@196049 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 85 insertions, 0 deletions

diff --git a/test/CodeGen/Mips/msa/frameindex.ll b/test/CodeGen/Mips/msa/frameindex.ll
new file mode 100644
index 0000000..3088e1b
--- /dev/null
+++ b/test/CodeGen/Mips/msa/frameindex.ll
@@ -0,0 +1,85 @@
+; RUN: llc -march=mips -mattr=+msa,+fp64 < %s | FileCheck -check-prefix=MIPS32-AE -check-prefix=MIPS32-BE %s
+; RUN: llc -march=mipsel -mattr=+msa,+fp64 < %s | FileCheck -check-prefix=MIPS32-AE -check-prefix=MIPS32-LE %s
+
+define void @loadstore_v16i8_near() nounwind {
+  ; MIPS32-AE: loadstore_v16i8_near:
+
+  %1 = alloca <16 x i8>
+  %2 = load volatile <16 x i8>* %1
+  ; MIPS32-AE: ld.b [[R1:\$w[0-9]+]], 0($sp)
+  store volatile <16 x i8> %2, <16 x i8>* %1
+  ; MIPS32-AE: st.b [[R1]], 0($sp)
+
+  ret void
+  ; MIPS32-AE: .size loadstore_v16i8_near
+}
+
+define void @loadstore_v16i8_just_under_simm10() nounwind {
+  ; MIPS32-AE: loadstore_v16i8_just_under_simm10:
+
+  %1 = alloca <16 x i8>
+  %2 = alloca [496 x i8] ; Push the frame right up to 512 bytes
+
+  %3 = load volatile <16 x i8>* %1
+  ; MIPS32-AE: ld.b [[R1:\$w[0-9]+]], 496($sp)
+  store volatile <16 x i8> %3, <16 x i8>* %1
+  ; MIPS32-AE: st.b [[R1]], 496($sp)
+
+  ret void
+  ; MIPS32-AE: .size loadstore_v16i8_just_under_simm10
+}
+
+define void @loadstore_v16i8_just_over_simm10() nounwind {
+  ; MIPS32-AE: loadstore_v16i8_just_over_simm10:
+
+  %1 = alloca <16 x i8>
+  %2 = alloca [497 x i8] ; Push the frame just over 512 bytes
+
+  %3 = load volatile <16 x i8>* %1
+  ; MIPS32-AE: addiu [[BASE:\$[0-9]+]], $sp, 512
+  ; MIPS32-AE: ld.b [[R1:\$w[0-9]+]], 0([[BASE]])
+  store volatile <16 x i8> %3, <16 x i8>* %1
+  ; MIPS32-AE: addiu [[BASE:\$[0-9]+]], $sp, 512
+  ; MIPS32-AE: st.b [[R1]], 0([[BASE]])
+
+  ret void
+  ; MIPS32-AE: .size loadstore_v16i8_just_over_simm10
+}
+
+define void @loadstore_v16i8_just_under_simm16() nounwind {
+  ; MIPS32-AE: loadstore_v16i8_just_under_simm16:
+
+  %1 = alloca <16 x i8>
+  %2 = alloca [32752 x i8] ; Push the frame right up to 32768 bytes
+
+  %3 = load volatile <16 x i8>* %1
+  ; MIPS32-AE: ori [[R2:\$[0-9]+]], $zero, 32768
+  ; MIPS32-AE: addu [[BASE:\$[0-9]+]], $sp, [[R2]]
+  ; MIPS32-AE: ld.b [[R1:\$w[0-9]+]], 0([[BASE]])
+  store volatile <16 x i8> %3, <16 x i8>* %1
+  ; MIPS32-AE: ori [[R2:\$[0-9]+]], $zero, 32768
+  ; MIPS32-AE: addu [[BASE:\$[0-9]+]], $sp, [[R2]]
+  ; MIPS32-AE: st.b [[R1]], 0([[BASE]])
+
+  ret void
+  ; MIPS32-AE: .size loadstore_v16i8_just_under_simm16
+}
+
+define void @loadstore_v16i8_just_over_simm16() nounwind {
+  ; MIPS32-AE: loadstore_v16i8_just_over_simm16:
+
+  %1 = alloca <16 x i8>
+  %2 = alloca [32753 x i8] ; Push the frame just over 32768 bytes
+
+  %3 = load volatile <16 x i8>* %1
+  ; MIPS32-AE: ori [[R2:\$[0-9]+]], $zero, 32768
+  ; MIPS32-AE: addu [[BASE:\$[0-9]+]], $sp, [[R2]]
+  ; MIPS32-AE: ld.b [[R1:\$w[0-9]+]], 0([[BASE]])
+  store volatile <16 x i8> %3, <16 x i8>* %1
+  ; MIPS32-AE: ori [[R2:\$[0-9]+]], $zero, 32768
+  ; MIPS32-AE: addu [[BASE:\$[0-9]+]], $sp, [[R2]]
+  ; MIPS32-AE: st.b [[R1]], 0([[BASE]])
+
+  ret void
+  ; MIPS32-AE: .size loadstore_v16i8_just_over_simm16
+}