Hi,
When ARMv8-M Baseline support was introduced no testcase was added for
support of the MOVT instruction because GCC would always prefer a load
from literal pool. With the recent work to fix -mslow-flash-data by
Andre Simoes Dias Vieira and Prakhar Bahuguna it is now possible to
test that support.
This commit adds a test for MOVT based on the MOVW test by using
-mslow-flash-data to ensure that GCC does not do a literal load of the
immediate. As such, this test is restricted to Cortex-M devices (where
-mslow-flash-data is available) with MOVT instruction.
ChangeLog entry is as follows:
*** gcc/testsuite/ChangeLog ***
2017-05-2017 Thomas Preud'homme <thomas.preudho...@arm.com>
* gcc.target/arm/movsi_movt.c: New test.
* gcc.target/arm/movdi_movt.c: New test.
Testing: the new tests have been tested to pass for ARMv7-M and
ARMv8-M (Baseline and Mainline) on arm-none-eabi and armeb-none-eabi
targets.
Is this ok for trunk?
Best regards,
Thomas
diff --git a/gcc/testsuite/gcc.target/arm/movdi_movt.c b/gcc/testsuite/gcc.target/arm/movdi_movt.c
new file mode 100644
index 0000000000000000000000000000000000000000..e2a28ccbd994ed0e4d0b9ac432df32138820432c
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/movdi_movt.c
@@ -0,0 +1,18 @@
+/* { dg-do compile { target { arm_cortex_m && { arm_thumb2_ok || arm_thumb1_movt_ok } } } } */
+/* { dg-options "-O2 -mslow-flash-data" } */
+
+unsigned long long
+movdi_1 (int a)
+{
+ return 0xF0F00000LLU;
+}
+
+unsigned long long
+movdi_2 (int a)
+{
+ return 0xF0F0000000000000LLU;
+}
+
+/* Accept r1 because big endian targets put the low bits in the highest
+ numbered register of a pair. */
+/* { dg-final { scan-assembler-times "movt\tr\[01\], 61680" 2 } } */
diff --git a/gcc/testsuite/gcc.target/arm/movsi_movt.c b/gcc/testsuite/gcc.target/arm/movsi_movt.c
new file mode 100644
index 0000000000000000000000000000000000000000..3cf46e2fd172ee1728b7b50c1cead90924962dca
--- /dev/null
+++ b/gcc/testsuite/gcc.target/arm/movsi_movt.c
@@ -0,0 +1,10 @@
+/* { dg-do compile { target { arm_cortex_m && { arm_thumb2_ok || arm_thumb1_movt_ok } } } } */
+/* { dg-options "-O2 -mslow-flash-data" } */
+
+unsigned
+movsi (void)
+{
+ return 0xF0F00000U;
+}
+
+/* { dg-final { scan-assembler-times "movt\tr0, 61680" 1 } } */
