Complex Partial Integers are unimplemented, resulting in an ICE when
attempting to use them. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79242
This results in GCC7/8 for msp430-elf failing to build.
typedef _Complex __int20 C;
C
foo (C x, C y)
{
return x + y;
}
(Thanks Jakub - https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79242#c2)
../../gcc/testsuite/gcc.target/msp430/pr79242.c: In function 'foo':
../../gcc/testsuite/gcc.target/msp430/pr79242.c:8:1: internal compiler
error: in make_decl_rtl, at varasm.c:1304
foo (C x, C y)
^~~
0xc07b29 make_decl_rtl(tree_node*)
../../gcc/varasm.c:1303
0x67523c set_parm_rtl(tree_node*, rtx_def*)
../../gcc/cfgexpand.c:1274
0x79ffb9 expand_function_start(tree_node*)
../../gcc/function.c:5166
0x6800e1 execute
../../gcc/cfgexpand.c:6250
The attached patch defines a new complex mode for PARTIAL_INT.
You may notice that genmodes.c:complex_class returns MODE_COMPLEX_INT for
MODE_PARTIAL_INT rather than MODE_COMPLEX_PARTIAL_INT. I reviewed the uses of
MODE_COMPLEX_INT and it doesn't looked like a Complex Partial Int requires any
different behaviour to MODE_COMPLEX_INT.
msp430_hard_regno_nregs now returns 2 for CPSImode, but I feel like this may be
better handled in the front-end. PSImode is already defined to only use 1
register, so for a CPSI shouldn't the front-end should be able to work out that
double the amount of registers are required? Thoughts?
Without the definition for CPSI in msp430_hard_regno_nregs,
rtlanal.c:subreg_get_info thinks that a CPSI requires 4 registers of size 2,
instead of 2 registers of size 4.
Successfully bootstrapped and tested for c,c++,fortran,lto,objc on
x86_64-pc-linux-gnu with no regressions on gcc-7-branch.
With this patch gcc-7-branch now builds for msp430-elf. A further bug prevents
trunk from building for msp430-elf.
If the attached patch is acceptable, I would appreciate if someone would commit
it for me, as I do not have write access.
From 31d8554ebb6afeb2d8f235cf3d3c262236aa5e32 Mon Sep 17 00:00:00 2001
From: Jozef Lawrynowicz <jozefl....@gmail.com>
Date: Fri, 12 Jan 2018 13:23:40 +0000
Subject: [PATCH] Add support for Complex Partial Integers - CPSImode
2018-01-XX Jozef Lawrynowicz <jozefl....@gmail.com>
gcc/
PR target/79242
* machmode.def: Define a complex mode for PARTIAL_INT.
* genmodes.c (complex_class): Return MODE_COMPLEX_INT for
MODE_PARTIAL_INT.
* doc/rtl.texi: Document CSPImode.
* config/msp430/msp430.c (msp430_hard_regno_nregs): Add CPSImode
handling.
(msp430_hard_regno_nregs_with_padding): Likewise.
gcc/testsuite/
PR target/79242
* gcc.target/msp430/pr79242.c: New test.
---
gcc/config/msp430/msp430.c | 4 ++++
gcc/doc/rtl.texi | 5 +++--
gcc/genmodes.c | 1 +
gcc/machmode.def | 1 +
gcc/testsuite/gcc.target/msp430/pr79242.c | 11 +++++++++++
5 files changed, 20 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/msp430/pr79242.c
diff --git a/gcc/config/msp430/msp430.c b/gcc/config/msp430/msp430.c
index 710a97b..c1f0d5b 100644
--- a/gcc/config/msp430/msp430.c
+++ b/gcc/config/msp430/msp430.c
@@ -905,6 +905,8 @@ msp430_hard_regno_nregs (int regno ATTRIBUTE_UNUSED,
{
if (mode == PSImode && msp430x)
return 1;
+ if (mode == CPSImode && msp430x)
+ return 2;
return ((GET_MODE_SIZE (mode) + UNITS_PER_WORD - 1)
/ UNITS_PER_WORD);
}
@@ -927,6 +929,8 @@ msp430_hard_regno_nregs_with_padding (int regno ATTRIBUTE_UNUSED,
{
if (mode == PSImode)
return 2;
+ if (mode == CPSImode)
+ return 4;
return msp430_hard_regno_nregs (regno, mode);
}
diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi
index b02e5a1..ebe2a63 100644
--- a/gcc/doc/rtl.texi
+++ b/gcc/doc/rtl.texi
@@ -1291,10 +1291,11 @@ point values. The floating point values are in @code{QFmode},
@findex CDImode
@findex CTImode
@findex COImode
-@item CQImode, CHImode, CSImode, CDImode, CTImode, COImode
+@findex CPSImode
+@item CQImode, CHImode, CSImode, CDImode, CTImode, COImode, CPSImode
These modes stand for a complex number represented as a pair of integer
values. The integer values are in @code{QImode}, @code{HImode},
-@code{SImode}, @code{DImode}, @code{TImode}, and @code{OImode},
+@code{SImode}, @code{DImode}, @code{TImode}, @code{OImode}, and @code{PSImode},
respectively.
@findex BND32mode
diff --git a/gcc/genmodes.c b/gcc/genmodes.c
index e56c08b..2af6556 100644
--- a/gcc/genmodes.c
+++ b/gcc/genmodes.c
@@ -116,6 +116,7 @@ complex_class (enum mode_class c)
switch (c)
{
case MODE_INT: return MODE_COMPLEX_INT;
+ case MODE_PARTIAL_INT: return MODE_COMPLEX_INT;
case MODE_FLOAT: return MODE_COMPLEX_FLOAT;
default:
error ("no complex class for class %s", mode_class_names[c]);
diff --git a/gcc/machmode.def b/gcc/machmode.def
index afe6851..6c84488 100644
--- a/gcc/machmode.def
+++ b/gcc/machmode.def
@@ -243,6 +243,7 @@ UACCUM_MODE (UTA, 16, 64, 64); /* 64.64 */
/* Complex modes. */
COMPLEX_MODES (INT);
+COMPLEX_MODES (PARTIAL_INT);
COMPLEX_MODES (FLOAT);
/* Decimal floating point modes. */
diff --git a/gcc/testsuite/gcc.target/msp430/pr79242.c b/gcc/testsuite/gcc.target/msp430/pr79242.c
new file mode 100644
index 0000000..d7ff8d3
--- /dev/null
+++ b/gcc/testsuite/gcc.target/msp430/pr79242.c
@@ -0,0 +1,11 @@
+/* { dg-do compile } */
+/* { dg-skip-if "" { "*-*-*" } { "-mcpu=msp430" "-msmall" } { "" } } */
+/* { dg-options "-mcpu=msp430x" } */
+
+typedef _Complex __int20 C;
+
+C
+foo (C x, C y)
+{
+ return x + y;
+}
--
2.7.4
