Fix justify error for small structures in varargs for MIPS64BE
There was a problem when passing structures as variable arguments.
The structures smaller than 64 bit were not left justified on MIPS64
big endian. This is now fixed by shifting the value to make it left-
justified when appropriate.
This fixes the bug http://llvm.org/bugs/show_bug.cgi?id=21608
Patch by Aleksandar Beserminji.
Differential Revision: http://reviews.llvm.org/D7881
llvm-svn: 230657
diff --git a/llvm/test/CodeGen/Mips/cconv/arguments-varargs-small-structs-combinations.ll b/llvm/test/CodeGen/Mips/cconv/arguments-varargs-small-structs-combinations.ll
new file mode 100644
index 0000000..899a3e8
--- /dev/null
+++ b/llvm/test/CodeGen/Mips/cconv/arguments-varargs-small-structs-combinations.ll
@@ -0,0 +1,149 @@
+; RUN: llc --march=mips64 -mcpu=mips64r2 < %s | FileCheck %s
+
+; Generated from the C program:
+;
+; #include <stdio.h>
+; #include <string.h>
+;
+; struct SmallStruct_1b1s {
+; char x1;
+; short x2;
+; };
+;
+; struct SmallStruct_1b1i {
+; char x1;
+; int x2;
+; };
+;
+; struct SmallStruct_1b1s1b {
+; char x1;
+; short x2;
+; char x3;
+; };
+;
+; struct SmallStruct_1s1i {
+; short x1;
+; int x2;
+; };
+;
+; struct SmallStruct_3b1s {
+; char x1;
+; char x2;
+; char x3;
+; short x4;
+; };
+;
+; void varArgF_SmallStruct(char* c, ...);
+;
+; void smallStruct_1b1s(struct SmallStruct_1b1s* ss)
+; {
+; varArgF_SmallStruct("", *ss);
+; }
+;
+; void smallStruct_1b1i(struct SmallStruct_1b1i* ss)
+; {
+; varArgF_SmallStruct("", *ss);
+; }
+;
+; void smallStruct_1b1s1b(struct SmallStruct_1b1s1b* ss)
+; {
+; varArgF_SmallStruct("", *ss);
+; }
+;
+; void smallStruct_1s1i(struct SmallStruct_1s1i* ss)
+; {
+; varArgF_SmallStruct("", *ss);
+; }
+;
+; void smallStruct_3b1s(struct SmallStruct_3b1s* ss)
+; {
+; varArgF_SmallStruct("", *ss);
+; }
+
+%struct.SmallStruct_1b1s = type { i8, i16 }
+%struct.SmallStruct_1b1i = type { i8, i32 }
+%struct.SmallStruct_1b1s1b = type { i8, i16, i8 }
+%struct.SmallStruct_1s1i = type { i16, i32 }
+%struct.SmallStruct_3b1s = type { i8, i8, i8, i16 }
+
+@.str = private unnamed_addr constant [3 x i8] c"01\00", align 1
+
+declare void @varArgF_SmallStruct(i8* %c, ...)
+
+define void @smallStruct_1b1s(%struct.SmallStruct_1b1s* %ss) #0 {
+entry:
+ %ss.addr = alloca %struct.SmallStruct_1b1s*, align 8
+ store %struct.SmallStruct_1b1s* %ss, %struct.SmallStruct_1b1s** %ss.addr, align 8
+ %0 = load %struct.SmallStruct_1b1s** %ss.addr, align 8
+ %1 = bitcast %struct.SmallStruct_1b1s* %0 to { i32 }*
+ %2 = getelementptr { i32 }* %1, i32 0, i32 0
+ %3 = load i32* %2, align 1
+ call void (i8*, ...)* @varArgF_SmallStruct(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i32 inreg %3)
+ ret void
+ ; CHECK-LABEL: smallStruct_1b1s:
+ ; CHECK: dsll $[[R1:[0-9]+]], $[[R2:[0-9]+]], 32
+}
+
+define void @smallStruct_1b1i(%struct.SmallStruct_1b1i* %ss) #0 {
+entry:
+ %ss.addr = alloca %struct.SmallStruct_1b1i*, align 8
+ store %struct.SmallStruct_1b1i* %ss, %struct.SmallStruct_1b1i** %ss.addr, align 8
+ %0 = load %struct.SmallStruct_1b1i** %ss.addr, align 8
+ %1 = bitcast %struct.SmallStruct_1b1i* %0 to { i64 }*
+ %2 = getelementptr { i64 }* %1, i32 0, i32 0
+ %3 = load i64* %2, align 1
+ call void (i8*, ...)* @varArgF_SmallStruct(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i64 inreg %3)
+ ret void
+ ; CHECK-LABEL: smallStruct_1b1i:
+ ; CHECK-NOT: dsll
+}
+
+define void @smallStruct_1b1s1b(%struct.SmallStruct_1b1s1b* %ss) #0 {
+entry:
+ %ss.addr = alloca %struct.SmallStruct_1b1s1b*, align 8
+ %.coerce = alloca { i48 }
+ store %struct.SmallStruct_1b1s1b* %ss, %struct.SmallStruct_1b1s1b** %ss.addr, align 8
+ %0 = load %struct.SmallStruct_1b1s1b** %ss.addr, align 8
+ %1 = bitcast { i48 }* %.coerce to i8*
+ %2 = bitcast %struct.SmallStruct_1b1s1b* %0 to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 6, i32 0, i1 false)
+ %3 = getelementptr { i48 }* %.coerce, i32 0, i32 0
+ %4 = load i48* %3, align 1
+ call void (i8*, ...)* @varArgF_SmallStruct(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i48 inreg %4)
+ ret void
+ ; CHECK-LABEL: smallStruct_1b1s1b:
+ ; CHECK: dsll $[[R1:[0-9]+]], $[[R2:[0-9]+]], 16
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture, i8* nocapture readonly, i64, i32, i1) #1
+
+define void @smallStruct_1s1i(%struct.SmallStruct_1s1i* %ss) #0 {
+entry:
+ %ss.addr = alloca %struct.SmallStruct_1s1i*, align 8
+ store %struct.SmallStruct_1s1i* %ss, %struct.SmallStruct_1s1i** %ss.addr, align 8
+ %0 = load %struct.SmallStruct_1s1i** %ss.addr, align 8
+ %1 = bitcast %struct.SmallStruct_1s1i* %0 to { i64 }*
+ %2 = getelementptr { i64 }* %1, i32 0, i32 0
+ %3 = load i64* %2, align 1
+ call void (i8*, ...)* @varArgF_SmallStruct(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i64 inreg %3)
+ ret void
+ ; CHECK-LABEL: smallStruct_1s1i:
+ ; CHECK-NOT: dsll
+}
+
+define void @smallStruct_3b1s(%struct.SmallStruct_3b1s* %ss) #0 {
+entry:
+ %ss.addr = alloca %struct.SmallStruct_3b1s*, align 8
+ %.coerce = alloca { i48 }
+ store %struct.SmallStruct_3b1s* %ss, %struct.SmallStruct_3b1s** %ss.addr, align 8
+ %0 = load %struct.SmallStruct_3b1s** %ss.addr, align 8
+ %1 = bitcast { i48 }* %.coerce to i8*
+ %2 = bitcast %struct.SmallStruct_3b1s* %0 to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i64(i8* %1, i8* %2, i64 6, i32 0, i1 false)
+ %3 = getelementptr { i48 }* %.coerce, i32 0, i32 0
+ %4 = load i48* %3, align 1
+ call void (i8*, ...)* @varArgF_SmallStruct(i8* getelementptr inbounds ([3 x i8]* @.str, i32 0, i32 0), i48 inreg %4)
+ ret void
+ ; CHECK-LABEL: smallStruct_3b1s:
+ ; CHECK: dsll $[[R1:[0-9]+]], $[[R2:[0-9]+]], 16
+}